Malicious PDF — malware analysis report

Static analysis result for SHA-256 61691c1c3c5cf28f…

MALICIOUS

PDF

81.0 KB Created: 2021-03-20 16:47:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ff903ef7f9b3e87d41a849c20be33d82 SHA-1: 58c5f40a0aae97af4d53c8c592be4cc6803fb0be SHA-256: 61691c1c3c5cf28f42b01045d79d3ae894e3680809e5e554455beabf4fb2bc84
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-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://lozipotod.ru/strik?utm_term=how+to+improve+lyrical+dance PDF link annotation
    • http://216tilford.com/lomafem7v5y.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419437/normal_6012b188634b5.pdfIn PDF document text
    • http://shoes-storie.club/whisky_words_and_a_shovel_iih27yh.pdfIn PDF document text
    • http://itasda.online/how_to_turn_on_jenn_air_induction_cooktopu4kt3.pdfIn PDF document text
    • http://freshnatur.fun/25503760347xp7n8.pdfIn PDF document text
    • http://klosheff.xyz/2004_cadillac_deville_owners_manual9lcm4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412575/normal_602521431c80e.pdfIn PDF document text
    • http://rentline.pro/freeze_warning_tonight_las_vegas9jcub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369797/normal_5fd19e9a68fbf.pdfIn PDF document text
    • https://cdn.sqhk.co/vexakebano/ggFjaje/cxc_biology_past_papers_2014_answers.pdfIn PDF document text
    • http://cashbackk.site/oedipus_the_king_character_analysis_essayg8n3e.pdfIn PDF document text
    • http://beremoter.online/measuring_angles_in_2d_shapes_worksheetsvocn9.pdfIn PDF document text
    • http://merovew.xyz/jemojixe15std.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425211/normal_60066441e8cd9.pdfIn PDF document text
    • http://chatik85939775.fun/radawumakewusodpb3a.pdfIn PDF document text
    • http://snapchat-alert.com/355592519553ccpp.pdfIn PDF document text
    • http://tertov.xyz/43988671517afkc9.pdfIn PDF document text
    • http://oficialshoes.site/jojajiwigufejajiwuftoyk.pdfIn PDF document text
    • https://cdn.sqhk.co/madagijoj/mhhhjsB/jatejizaribewurusuwo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8fc1c2d6-49ba-4d63-8b95-0327ef2b1627.filesusr.com/ugd/1849a1_53d7186ece0f4999943973a951d55586.pdf?index=trueIn PDF document text
    • https://d5e9a058-cbdc-4968-ba72-30cdbf1e36a3.filesusr.com/ugd/9cfd0a_206b593496d549bc8686d542ab4fc681.pdf?index=trueIn 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_off00010011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10011 5256 bytes
SHA-256: d7107be73f4aed6d17d05b0bc6d2a952287feab492c3ec9f40f9b250e2eebf75
font_01_sfnt_off000111f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F2 10812 bytes
SHA-256: 269b00d528e23c098cd7646fd64a2f8c29e93e1496cad04dec8c50000057ac4f

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