Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac43fa386d891d55…

MALICIOUS

PDF

70.3 KB Created: 2021-01-13 15:49:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: a1dcbb2262b6fd474c5d8878656c04a4 SHA-1: df99d9e6b1f862b21b1a19d18937c8beb57b78ad SHA-256: ac43fa386d891d55663dcb0c948bd9c40117bf91851d2e01625aa3d4407c8767
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting it's part of a link farm or SEO manipulation scheme. The presence of embedded URLs and the nature of the heuristics indicate a potential phishing or malware distribution vector, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffe.ru/aws?utm_term=gcse+maths+algebra+worksheets+pdf PDF link annotation
    • https://site-1171372.mozfiles.com/files/1171372/bumajatoboso.pdfIn PDF document text
    • https://site-1174086.mozfiles.com/files/1174086/balance_sheet_definition_in_accounting.pdfIn PDF document text
    • https://site-1172367.mozfiles.com/files/1172367/anbe_sivam_movie_hd_tamilrockers.pdfIn PDF document text
    • https://jinobodusere.weebly.com/uploads/1/3/4/7/134722577/xuvep.pdfIn PDF document text
    • https://wunabigoji.weebly.com/uploads/1/3/4/8/134891590/103198.pdfIn PDF document text
    • https://titawijuneve.weebly.com/uploads/1/3/4/0/134012454/pajadome.pdfIn PDF document text
    • https://gemiletux.weebly.com/uploads/1/3/2/6/132681217/mafukakowumoxa-dexawozemuluz-xekaluwatuwan-rurogojosur.pdfIn PDF document text
    • https://site-1211548.mozfiles.com/files/1211548/14959122648.pdfIn PDF document text
    • https://cdn.sqhk.co/wolitobutak/hih9uQo/spin_blade_metal_fight_burst.pdfIn PDF document text
    • https://site-1166064.mozfiles.com/files/1166064/human_shields_book.pdfIn PDF document text
    • https://site-1168300.mozfiles.com/files/1168300/39440476046.pdfIn PDF document text
    • https://site-1175317.mozfiles.com/files/1175317/i_love_crosswords_3_answers_level_4.pdfIn PDF document text
    • https://zebamejiwan.weebly.com/uploads/1/3/4/3/134312785/solaxet_sosigof_lotonus_nemimowawo.pdfIn PDF document text
    • https://site-1178466.mozfiles.com/files/1178466/51483724035.pdfIn PDF document text
    • https://site-1168401.mozfiles.com/files/1168401/best_friend_status_quotes_in_english.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32E 5896 bytes
SHA-256: adf74251613f80996c8230f70cd54c93a1b44db98ad24b751c7d05ab96fb5a68
font_01_sfnt_off0000e728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE728 11012 bytes
SHA-256: 5627254b60170addcaca58a6d816b08c8577a39b0f6b642d5fb93ddb5c0dfa6b

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