Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9da058f38b0bbda…

MALICIOUS

PDF

76.6 KB Created: 2021-04-04 04:35:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 265a0c9c5fb6fb7a9ba2c6ff4abc02ab SHA-1: 7441d24192798c2f6ad0f6c694970fd8b5f81e3b SHA-256: d9da058f38b0bbda4e47c5620d4348a6559780c975cbf72bdfc2fb35f298c598
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9997

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://bologen.ru/award?keyword=active+learning+techniques+higher+education+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409796/normal_6043f68d1f4b9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421639/normal_5fc8a02c57047.pdfIn PDF document text
    • http://lebizifijafaxim.medianewsonline.com/replacement_pump_for_drinkwell_360_pet_fountain.pdfIn PDF document text
    • https://cdn.sqhk.co/kigoxeni/h6vMMge/povir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418370/normal_5fdde1fb6f940.pdfIn PDF document text
    • http://nuloriwilorij.scienceontheweb.net/how_to_adjust_poulan_wild_thing_carb.pdfIn PDF document text
    • https://cdn.sqhk.co/kozuvurop/pXjcjDi/jowimobeb.pdfIn PDF document text
    • http://f13x.xyz/toro_power_clear_180_snow_throwerxkair.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385014/normal_6063528f1774b.pdfIn PDF document text
    • http://vehicleinsusa.com/fowujo07vv1.pdfIn PDF document text
    • http://lafutib.sportsontheweb.net/3421656548.pdfIn PDF document text
    • http://legegapepapo.medianewsonline.com/tumedeji.pdfIn PDF document text
    • https://cdn.sqhk.co/vujenibolo/bhi3qAA/xakodon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405644/normal_605c382727ff7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482860/normal_6011e9b97083a.pdfIn PDF document text
    • https://cdn.sqhk.co/loganidob/Cifgj8I/dog_cat_bird_picture.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/3db55e2a-1b51-45b7-a731-303f388c61d7/24898056447.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bc2bd9c-5e90-4057-a77f-b50b6b892876/kegavawuvatebigamob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/379cf204-6412-402e-971f-b098abfea816/19860676239.pdfIn PDF document text
    • http://pidodexogejax.myartsonline.com/o_albinismo.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_off0000ec0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0A 5592 bytes
SHA-256: f9139b2164e763897f5de1be03f2699895923ea297f819b47d7b7921094ef9fd
font_01_sfnt_off0000ff06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF06 11400 bytes
SHA-256: 1c780d49ac170bd882a38494bee6baacc705644778d7e1985245d2ecff06ecf1

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