Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad1e1a6da63e7a66…

MALICIOUS

PDF

79.1 KB Created: 2021-04-12 01:52:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0dd3ffad9e38f72241c22735b1a14fc7 SHA-1: 07f279e157860ea6e7eb3c65edf14c518f51d364 SHA-256: ad1e1a6da63e7a66067a750c59219b3823d3cbce39207895d2e9e23635a7c132
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, a common tactic for link farms and phishing campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body appears to be malformed or corrupted, but the presence of numerous URLs, including one with a 'utm_term' parameter, suggests an attempt to direct users to potentially harmful websites.

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://druttle.ru/strik?utm_term=what+is+the+best+sodastream+to+buy+in+australia PDF link annotation
    • http://biomanua.website/31689131757ln0ay.pdfIn PDF document text
    • http://okclub.org/principles_of_biochemistry_5th_edition_citation20tzp.pdfIn PDF document text
    • http://bitsracing.net/zakejphc1x.pdfIn PDF document text
    • http://copyright-rules-help.com/hp_stream_11_pro_g2_laptop1ggf5.pdfIn PDF document text
    • http://helpverifybadges.com/what_flower_symbolizes_lifekexdq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8a7e94d2-1b07-4399-8a7b-cfebf1eb419e.filesusr.com/ugd/e78b77_348de2f1acf54208bdeea3f65e73e060.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/toguvaju/how_to_perform_salatul_istikhara_for_marriage.pdfIn PDF document text
    • https://d8d691c7-cf48-432b-bece-a54604b57851.filesusr.com/ugd/1e3a4b_ec7f6aada49e4b22bad40eb61698330d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/04e5fa4e-7f77-4bd2-9ec9-be27aff68cc8/7495230610.pdfIn PDF document text
    • https://61249681-e2d1-4375-841a-b3723294d79c.filesusr.com/ugd/3d514e_5e79d3d863ba43ebae1f9850909c89a2.pdf?index=trueIn PDF document text
    • https://83c30a2d-d83c-4020-88f4-fdb7bed8c9e2.filesusr.com/ugd/e59e18_27c614f4d7924eee8e08c8ac6b039035.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vukujidor/71862035149.pdfIn PDF document text
    • https://s3.amazonaws.com/posaxugidut/32907035393.pdfIn PDF document text
    • https://d75bbb92-b0e4-4b50-83e6-2443e695523b.filesusr.com/ugd/bc73b9_f0c09d195f9142859710763e15fe7041.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zikeko/list_of_guided_reading_level_p_books.pdfIn PDF document text
    • https://b40f07b9-a98f-42b6-a6e2-5dc2c82ebb0e.filesusr.com/ugd/e949ea_9978c5c0b39b46dc9d229ddd4af14b8b.pdf?index=trueIn PDF document text
    • https://c6506652-bf5e-4f52-be36-03dbfaede22c.filesusr.com/ugd/f74919_23f118a5a2ac41fe88256bc0716869c0.pdf?index=trueIn PDF document text
    • https://591e60e9-54e8-4b06-a9a7-f2e0522969d0.filesusr.com/ugd/1fd4b7_d71c4857373c4d5cbfefdf013ba19bb6.pdf?index=trueIn PDF document text
    • https://f7927488-8152-43cb-a667-e231f58cc5c5.filesusr.com/ugd/950cc9_bd0aa572a29048338584ccaf900bba68.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/22380c74-4012-42e2-b0e8-7b7d83eb3036/tipafegil.pdfIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/warhammer_40k_8th_edition_rulebook_vk.pdfIn PDF document text
    • https://f1ddcea9-c323-452c-a4d3-aaefec61e50a.filesusr.com/ugd/defd8a_d0b82afa94844f3484f28a8f9797d52a.pdf?index=trueIn PDF document text
    • https://307a23dc-bb60-4906-9a68-69e45957aa19.filesusr.com/ugd/d2057d_361954da9e0f4052867c9124ae71c7b1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/599dffc8-ce6f-4e95-857a-13281bf42594/what_are_the_three_elements_of_poetry.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_off0000f66e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66E 5320 bytes
SHA-256: 2312c8b6b2a017792d8ec10d21571ec70d112510827879390c6daaf647fcb780
font_01_sfnt_off00010864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10864 11280 bytes
SHA-256: 871d7bda52c193e5e81e28df7bc36195299cfcf310939fdb3c63917e82c04baa