Malicious PDF — malware analysis report

Static analysis result for SHA-256 13ab7c16532655de…

MALICIOUS

PDF

103.8 KB Created: 2021-05-13 23:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 3f8eecd6de8fc8b406c2b3e834db03b3 SHA-1: f96ade850bfcab576800cb65c33065fa46196484 SHA-256: 13ab7c16532655de446745ab979114cb02016d7c3d1da304a0bc625784eab6f1
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were extracted, the PDF structure and embedded URLs point towards a common tactic of redirecting users to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://bologen.ru/strik?utm_term=dewalt+d55168+type+6+parts PDF link annotation
    • http://reduslim-buy.site/angels_and_demons_dan_brown_synopsisr4fdy.pdfIn PDF document text
    • http://limuzinof.ru/how_to_reset_yale_alarm_systembyo9n.pdfIn PDF document text
    • http://raisinshq.pro/46509954245ha7za.pdfIn PDF document text
    • http://goodsun.space/xafozexobezaruzukedulgf2h.pdfIn PDF document text
    • http://limuzinof.ru/17504965379r5nj2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_12bc3eae620b428bad4ef08e97897769.pdf?index=trueIn PDF document text
    • https://29c5b005-6627-40e3-9da1-9f9d3dbc34dc.filesusr.com/ugd/7ad284_7c997a1dd9a8494b9dfaf96c89a000dc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/merriam_webster_dictionary_pro_apk.pdfIn PDF document text
    • https://b0837e58-6fb0-4b2c-a83d-c451c4d85cc2.filesusr.com/ugd/1169b1_6f72ad40d0b74744910cca701db28bf4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jipowumat/grendel_novel_google_docs_1-6.pdfIn PDF document text
    • https://7aff118d-26f6-4d76-9bc9-1838009e7274.filesusr.com/ugd/f80014_b5a97a7f74024a6694e0b72fb611a83d.pdf?index=trueIn PDF document text
    • https://87da31d5-d184-45e7-a456-0ad082c8bd65.filesusr.com/ugd/55e94a_d539b4d9e21b4e2a9aba8d4fd294a627.pdf?index=trueIn PDF document text
    • https://72858ab8-d36f-4bc2-b208-e5ec56e76d01.filesusr.com/ugd/3a4e0e_5717510d38024956b9683d5016063422.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/nova_hunting_the_elements_worksheet_answers_part_1.pdfIn PDF document text
    • https://ececae0b-1312-4a4c-959a-117928b3d478.filesusr.com/ugd/e6721e_d0ff82b22d3a4a069a70a09b8d21cd13.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b06db8f8-e814-4181-b390-2aad0fcce10e/96280239004.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23cca320-0b42-403f-a77e-539c0ed0bd0d/62034261416.pdfIn PDF document text
    • https://eed7fa7e-4f31-4ba6-8269-e73f07ac74c5.filesusr.com/ugd/93374d_6e8e4ab1d0404f6d8e55791d7d8089bc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/253443ed-f7a9-4edf-9a3e-a102dfcd6a85/35492273625.pdfIn PDF document text
    • https://s3.amazonaws.com/kotenu/guitar_chord_books_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcff5e9d-bb44-42d9-bb0f-d19b12aef576/korex.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/gmat_sentence_correction_with_answers.pdfIn PDF document text
    • https://d4180a97-8dd0-4bf1-9e2f-d1b128d1a64d.filesusr.com/ugd/ae059d_fd463e8f6098401c9ce12a5e0f7ed734.pdf?index=trueIn PDF document text
    • https://11be7779-5615-4adc-aeb2-17624735b21e.filesusr.com/ugd/b0b521_0c2e905e529a4becb230b0c93e697662.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/838d0802-3037-4b19-87e4-578861eb85b9/how_to_measure_a_chainsaw_chain_pitch.pdfIn PDF document text
    • https://9d3edb37-11ce-4d87-b861-4f8d850d55a0.filesusr.com/ugd/0d2aa0_941a756baf3e4baa9552e26149f611b4.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000145ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145CE 5192 bytes
SHA-256: cd25229dbc9d48c4fa71a6453c16f9457b37a003b4a0b8467b928afa5fd5506d
font_01_sfnt_off000157a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157A0 12936 bytes
SHA-256: 7d6affa103a330b2ce83f18c1449e6bc254c22c0e21f7cf2a0b2b58466c1cc0d
font_02_sfnt_off0001833a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1833A 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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