Malicious PDF — malware analysis report

Static analysis result for SHA-256 769e91f030a1a981…

MALICIOUS

PDF

77.6 KB Created: 2021-02-13 13:39:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: e8f98391a06335ebaae4338ef020bd0b SHA-1: 50e7e0a575e7cc8dc5b1b07b774ba0c2574fb954 SHA-256: 769e91f030a1a9819f6aae55d90f04b40edd4584a890c1ce377d89148cad224b
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate that the primary purpose is to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://maypoin.ru/123?utm_term=right+triangle+worksheet+answers PDF link annotation
    • https://vivazezege.weebly.com/uploads/1/3/4/0/134041722/3848851.pdfIn PDF document text
    • https://vekewofamir.weebly.com/uploads/1/3/4/1/134131384/2990872.pdfIn PDF document text
    • https://cdn.sqhk.co/rivitovolu/bihBaia/chess_board_table_for_sale.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450160/normal_5fe64ee087efe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453108/normal_6010f5dfd5eb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369930/normal_601ba87d66f09.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448750/normal_60046c170d564.pdfIn PDF document text
    • https://cdn.sqhk.co/wodabakope/hhaiasC/92649065657.pdfIn PDF document text
    • https://cdn.sqhk.co/janezewufaj/iBhbjcK/farm_town_cartoon_story_mod.pdfIn PDF document text
    • https://juruditusevowe.weebly.com/uploads/1/3/5/3/135329261/476e626b3b78.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365619/normal_60078c53aac3c.pdfIn PDF document text
    • https://dikijezirepa.weebly.com/uploads/1/3/2/8/132815872/4873717.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jusagi/volaluzolesupudob.pdfIn PDF document text
    • http://rawozenagi.epizy.com/acanac_internet_speed.pdfIn PDF document text
    • https://s3.amazonaws.com/nodetuxapabara/international_business_contract_template.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE788 2960 bytes
SHA-256: 3c6502e04658d985b37ed967139d4b1bb7136c1c8ff06868e6b64c17630b7d50
font_01_sfnt_off0000f20b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20B 5112 bytes
SHA-256: ce49ce7d2c4b32a1c934ac62e5c9bd1356380db90ebc2a2efc4dee35b872d777
font_02_sfnt_off0001037f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037F 11072 bytes
SHA-256: 6f90b8968863a99ea5c0e6c0220d55bbcaaf28e9027c26c55c43cf2222105267

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