Malicious PDF — malware analysis report

Static analysis result for SHA-256 28a33906348dec2f…

MALICIOUS

PDF

68.9 KB Created: 2021-01-12 12:47:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 49d6b3737a4ea9ca87c182e38e08c636 SHA-1: eeac96820fb147628a82302c7414735a8c09fb95 SHA-256: 28a33906348dec2fb2c8f432ed2479a52acc1c4692ebe2c1cfda43efbcb73249
126 Risk Score

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafftec.ru/123?utm_term=patch+burn+grazing PDF link annotation
    • https://worijuxadije.weebly.com/uploads/1/3/4/8/134863955/da282fa.pdfIn PDF document text
    • https://site-1177443.mozfiles.com/files/1177443/anime_avatar_creator_dress_up_games.pdfIn PDF document text
    • https://site-1172346.mozfiles.com/files/1172346/titigapaxa.pdfIn PDF document text
    • https://site-1173509.mozfiles.com/files/1173509/introduction_to_statistical_quality_control_montgomery.pdfIn PDF document text
    • https://site-1180367.mozfiles.com/files/1180367/freaky_scary_sounds.pdfIn PDF document text
    • https://mawosamaretezij.weebly.com/uploads/1/3/4/8/134860838/wuwewapawoxizemaki.pdfIn PDF document text
    • https://kexexetipo.weebly.com/uploads/1/3/4/8/134897314/48740990766.pdfIn PDF document text
    • https://site-1168375.mozfiles.com/files/1168375/construction_images_hd_free.pdfIn PDF document text
    • https://site-1175420.mozfiles.com/files/1175420/sixodozorewazave.pdfIn PDF document text
    • https://jazetixi.weebly.com/uploads/1/3/4/4/134494542/505137.pdfIn PDF document text
    • https://cdn.sqhk.co/bewewojiwo/giidid6/plus_messenger_for_pc_windows_download.pdfIn PDF document text
    • https://site-1178541.mozfiles.com/files/1178541/princess_3_old_bridge_place_howell_nj_07731.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_off0000d240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD240 5040 bytes
SHA-256: 470a9a467195e3c416239806e4c2daafb11dfbb82103ed37f176aeacf19753df
font_01_sfnt_off0000e36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36B 10560 bytes
SHA-256: c806931b7c197b44dd1b70552c0e8bca3213f876e6ffa89ac1ee3535f072f9d3

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