Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad159d7af858124b…

MALICIOUS

PDF

77.8 KB Created: 2021-03-01 06:16:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 465099b5f2965c84a89cc2ed58628e93 SHA-1: 9c9b780cc48c995fdb10704e920c90ac23c80a44 SHA-256: ad159d7af858124ba6b4707ad0b4eea0ef24e2242d8094330f4bd1efff3f6613
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 0.9998

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://fokemale.ru/123?utm_term=weber+grill+restaurant+coupons+lombard PDF link annotation
    • http://microbestdigitalmeter.xyz/best_biodata_format_for_jobulsv4.pdfIn PDF document text
    • http://adyga.site/school_report_card_making_software_freeevzco.pdfIn PDF document text
    • https://nibafokabatawal.weebly.com/uploads/1/3/0/9/130970001/4990449.pdfIn PDF document text
    • https://mosagalalevo.weebly.com/uploads/1/3/4/6/134668437/gasutigufizod.pdfIn PDF document text
    • http://manuximaxemeje.scienceontheweb.net/12297913097.pdfIn PDF document text
    • http://ouily.xyz/nasonerodapivodo4u6w0.pdfIn PDF document text
    • http://gexopidikimo.mygamesonline.org/12718537578.pdfIn PDF document text
    • http://priz24.site/bullhorn_peoplenet_timesheet3mdgq.pdfIn PDF document text
    • http://termometr-medikal.site/68677466914cge7x.pdfIn PDF document text
    • https://ramipataxeki.weebly.com/uploads/1/3/4/4/134483057/7218145.pdfIn PDF document text
    • https://fuwodeku.weebly.com/uploads/1/3/6/0/136095673/relupovegu.pdfIn PDF document text
    • http://it50disconto.pro/159621097438oaln.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/tenunud/rounding_decimals_worksheet_b_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/sedowedi/93468671536.pdfIn PDF document text
    • https://s3.amazonaws.com/pizexopenaxu/apprendre_le_russe_facilement.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_off0000e83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83A 2960 bytes
SHA-256: ba9dd86ad06677ef82b9fc66565cbe1db364e5caa8fb73f24ce3e10b7ab9a08b
font_01_sfnt_off0000f2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BD 5548 bytes
SHA-256: b05afb7601f866b6bc879ca3d4890c5aef9241b638c6eb81a307a8215c2e919c
font_02_sfnt_off0001058e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058E 10456 bytes
SHA-256: 9daaf12f80e1d2a2200e1db5a6ffe93995df1a971a31a867a1d0c590dc3445bc

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