Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad43b06e5382d7ea…

MALICIOUS

PDF

75.7 KB Created: 2021-04-05 14:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f44a94c6c5ef4cc0dff8470ecf252de2 SHA-1: 15747320cade17f8f748b7c9423b58bc91a77db7 SHA-256: ad43b06e5382d7ea882973fdb835939eeda52cb7d8b836af3aa7af878970b64d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/strik?utm_term=how+to+use+a+ego-t+vape+pen PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4463794/normal_601ad455f1453.pdfIn PDF document text
    • https://dagazafija.weebly.com/uploads/1/3/1/4/131484603/a8b1b825.pdfIn PDF document text
    • https://mufudenufasos.weebly.com/uploads/1/3/4/4/134492520/4938815.pdfIn PDF document text
    • https://xuzopodoker.weebly.com/uploads/1/3/0/7/130738955/munibenafafumopub.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483349/normal_5ffff8ac9cadf.pdfIn PDF document text
    • https://morogixifidogaj.weebly.com/uploads/1/3/4/4/134497599/maxifobozi.pdfIn PDF document text
    • https://fegajasun.weebly.com/uploads/1/3/4/5/134502742/b6396b07a75c47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383792/normal_604b3a022150d.pdfIn PDF document text
    • https://xekuvezenigut.weebly.com/uploads/1/3/5/3/135346982/nujapasu.pdfIn PDF document text
    • https://nosuxiseliv.weebly.com/uploads/1/3/4/5/134578333/xagejofusufu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446286/normal_5fcd3150e2200.pdfIn PDF document text
    • https://patapirebitogi.weebly.com/uploads/1/3/0/8/130814085/1486216.pdfIn PDF document text
    • https://diriremipujuna.weebly.com/uploads/1/3/4/2/134265666/520ca888b0cb7dd.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/cd2ffc15-a9f2-4932-8a40-cba3c186cdb4/nitozux.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/79202638351.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ff34132-d835-4e87-8fd8-b6895b876ed3/72853966377.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdacd913-badd-41df-b224-9ca45241864a/how_do_you_use_heat_and_bond_hem.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/7427798819.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef543f8c-f1e8-4509-84fb-5d40331fa65f/how_to_deal_with_disruptive_behavior_in_class.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/174871da-266f-4880-9349-9bfc28c90bc8/blues_licks_with_chords.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/film_anti_social_2015.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_off0000ec2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2D 5004 bytes
SHA-256: b02eef39f7898f6ab14557d28cd14793d41d04559af52a7eb104110035b46e8a
font_01_sfnt_off0000fd6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6E 10728 bytes
SHA-256: 2d5b3d3e92bee0ad79b5da3d66afba0c58e872df37c3caaa7987675cad5b282d

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