Malicious PDF — malware analysis report

Static analysis result for SHA-256 c73506cb21af4dce…

MALICIOUS

PDF

81.9 KB Created: 2021-03-10 03:06:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f40b8b7d52dfd1d1b31aa1cf1c97cced SHA-1: da53287b8c68d51b8cfdaee32852b06d36e831c3 SHA-256: c73506cb21af4dce271045e72fe9c763fb1a0fc036950f565940baaafc187b97
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 0.9998

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://ponafet.ru/strik?utm_term=lifetime+elite+52+in-ground+basketball+hoop+reviews PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4481993/normal_5fdf9861b32ac.pdfIn PDF document text
    • https://zivexuxa.weebly.com/uploads/1/3/1/8/131871677/b5f5d7a691b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454977/normal_602c775019e96.pdfIn PDF document text
    • https://kuxiwidozerapi.weebly.com/uploads/1/3/4/7/134728536/pinogumora_gujozulavedewi_pitomipik_poxub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393511/normal_603418f836a87.pdfIn PDF document text
    • http://pikejofopon.mypressonline.com/89778760246.pdfIn PDF document text
    • http://natlab.ru/catalogo_de_pernos_y_tuercasbiblv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445333/normal_6045bc9cba5d1.pdfIn PDF document text
    • https://vegilumos.weebly.com/uploads/1/3/1/3/131383621/wujezo.pdfIn PDF document text
    • http://cherrypimp.online/17247417710r6kfn.pdfIn PDF document text
    • http://rigudozefogo.mypressonline.com/fluval_306_canister_filter_specs.pdfIn PDF document text
    • https://bogonifad.weebly.com/uploads/1/3/4/1/134108647/tovipenepexe-rujazer-zamarutixirew-wujukigi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484805/normal_6030e5ebd8f0f.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/muwomapotumugi/gerd_guidelines_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/desolate_game_guide.pdfIn PDF document text
    • https://4bf641bf-117a-4913-931f-55e49063997f.filesusr.com/ugd/5befcb_a99b3423abca4caaad60f3b8d9558a41.pdf?index=trueIn PDF document text
    • https://a0a5ada1-270c-452f-b092-d943fc6f0dc0.filesusr.com/ugd/306762_e5bfeb8c6f884044b37d433b74b4bd6f.pdf?index=trueIn PDF document text
    • http://roporuti.onlinewebshop.net/utilitech_three_outlet_outdoor_timer_instructions.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_off0000f6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A4 2952 bytes
SHA-256: d8b907802410e675ceca2784509e58a9dae2947c1b2ad43e3e0c02687eabed47
font_01_sfnt_off00010132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10132 6040 bytes
SHA-256: 482a17e20d4ea47144b6a8f3e2ac719470b087da74ad8941a3d5fab877945435
font_02_sfnt_off000115b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B5 10576 bytes
SHA-256: ac0ed6a8a6215207960f07d5aea6a5fbe151fc093f4068ee61f04712b1a2d3a2

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