Malicious PDF — malware analysis report

Static analysis result for SHA-256 82bba5194c43a286…

MALICIOUS

PDF

79.5 KB Created: 2021-03-10 02:01:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f66c459e9c58220b04dc27bdd8bed2dd SHA-1: 5006c1fa76588d59ea53a081f224888a465adf18 SHA-256: 82bba5194c43a286ca079db4ca875e596bfdf01872769c4f23b4fec3bb3e907b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://botokaw.ru/award?keyword=jpg2pdf+i+love+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4406463/normal_600523e43f9ee.pdfIn PDF document text
    • https://mibonujatupogu.weebly.com/uploads/1/3/5/2/135297119/5e42e7b3.pdfIn PDF document text
    • https://kerozutovazo.weebly.com/uploads/1/3/0/8/130813796/nojivukozusigexudo.pdfIn PDF document text
    • https://pufegigan.weebly.com/uploads/1/3/1/0/131070168/6640547.pdfIn PDF document text
    • https://givodevivunafa.weebly.com/uploads/1/3/1/8/131871579/80f237906b2d45.pdfIn PDF document text
    • https://xivovawa.weebly.com/uploads/1/3/4/8/134875493/kawopukave.pdfIn PDF document text
    • https://peturenu.weebly.com/uploads/1/3/4/4/134401199/e8f2b34713.pdfIn PDF document text
    • https://gazesomudari.weebly.com/uploads/1/3/1/0/131070071/xumikesep.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486045/normal_5fe33dc95c204.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445555/normal_6044fc5c8df43.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447085/normal_5ff0c24659e89.pdfIn PDF document text
    • https://nodajalij.weebly.com/uploads/1/3/5/9/135990600/6200140.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/42308df5-4dde-4f08-b6df-ea83c40492a6/sas_ods_excel_tagset_styles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d7525db-6633-463c-b45d-7e4fc2870bd1/how_to_determine_chainsaw_chain_file_size.pdfIn PDF document text
    • https://78e27e65-9996-4239-a63d-7a21722db537.filesusr.com/ugd/03f576_66f65314528f4b5781d521e26c8742bd.pdf?index=trueIn PDF document text
    • https://2e8e3215-33bf-4fe1-bc67-b38dac560527.filesusr.com/ugd/269bb8_d1481f18d1d0460ca20b3637de71c6a8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c0ef5d0-af27-486f-9a6f-0ce1d3195754/exercicios_quimica_organica_nomenclatura_hidrocarbonetos_com_gabarito.pdfIn PDF document text
    • https://4cd5a77a-be8d-44ba-8952-4177873115c4.filesusr.com/ugd/930050_89063a0952b745f1ae36705d62c9bbc3.pdf?index=trueIn PDF document text
    • https://2a4b29e6-a790-453e-81e7-e8b9caf2c27b.filesusr.com/ugd/bf0735_647ac4ba18d3428c9217ad9b2794d11d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee7d27c8-ab89-4652-aa65-978e3dc60156/pocket_surgery_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6a4de6a-40f2-402d-a0cd-835dcf3a4ce1/pofer.pdfIn PDF document text
    • https://9462281c-6212-45c1-8f90-c4e3c363a226.filesusr.com/ugd/007d40_a30d9aac640e4bc3a64b61bfdc934324.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d6a6a70-08eb-42ed-9d50-599fbd60a106/4123640602.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37b03a07-842f-4551-ab6d-07ab32b86208/56803839435.pdfIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA51 4904 bytes
SHA-256: 317cb5a73799e64175e498314146f07607f7319eeeffddf0d8281384be5d37fe
font_01_sfnt_off00010b2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2F 10820 bytes
SHA-256: 3fe2fe1ce9065bdd9f8b5469bd3b55ecd7d097119b9cd5759fe5f6df74664c68

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