Malicious PDF — malware analysis report

Static analysis result for SHA-256 6afb25bd8f7085bd…

MALICIOUS

PDF

74.0 KB Created: 2021-05-29 08:40:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: fa72f5d34cec50adc05de5efae229ac9 SHA-1: 82e19c917805475b9cd4b736f2ec8f3af01338f8 SHA-256: 6afb25bd8f7085bd14635f5281b22a854d314de7e7a4c88cf72fb0c023a89103
186 Risk Score

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 0.9993

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://xezojetit.ru/123?utm_term=activity+sheets+letter+b PDF link annotation
    • https://zovakobazala.weebly.com/uploads/1/3/1/4/131456363/mejokezedip-pesat-zofifotirasa-pobumero.pdfIn PDF document text
    • https://duvokazi.weebly.com/uploads/1/3/4/1/134108747/7a50984c.pdfIn PDF document text
    • https://pisolapep.weebly.com/uploads/1/3/4/6/134648883/221695.pdfIn PDF document text
    • https://fojanatixisi.weebly.com/uploads/1/3/4/2/134265346/150c2c6b80fd.pdfIn PDF document text
    • https://dibovasejul.weebly.com/uploads/1/3/1/0/131070518/1453138.pdfIn PDF document text
    • https://mulanazujejuxu.weebly.com/uploads/1/3/4/8/134855463/dijiwokasagixa-zubojax.pdfIn PDF document text
    • https://rojusonevupa.weebly.com/uploads/1/3/0/8/130814232/wulejupi_tenej.pdfIn PDF document text
    • https://pagajunudew.weebly.com/uploads/1/3/5/9/135992687/budewugudinefidane.pdfIn PDF document text
    • https://xusemiwo.weebly.com/uploads/1/3/4/8/134899199/909027.pdfIn PDF document text
    • https://xusawoji.weebly.com/uploads/1/3/0/7/130739635/resej-gigulekami-xilupurimanafos-jatoxedoju.pdfIn PDF document text
    • https://najunewuzerus.weebly.com/uploads/1/3/1/4/131408250/0e5fc9509f.pdfIn PDF document text
    • https://katatowuli.weebly.com/uploads/1/3/4/8/134879603/refapesezu.pdfIn PDF document text
    • https://faluwesidiji.weebly.com/uploads/1/3/0/7/130738597/2593204.pdfIn PDF document text
    • https://gedenotovet.weebly.com/uploads/1/3/1/3/131379555/bazikarup-tevuvibuk-risirowo.pdfIn PDF document text
    • https://funiduned.weebly.com/uploads/1/3/4/7/134773133/rejowaga.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/a42f8110-093a-4498-bb60-f24f34825afe/9669123786.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9060293e-5660-4ed8-b42d-272e0142cae9/59503185675.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86376261-f36f-40af-bcc7-62a92e0304e9/garmin_nuvi_3597_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1a72b2b-eb9a-41e3-b2a7-affb1e6b10f3/how_to_lose_weight_with_calorie_counter_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac671de7-999c-4d77-b9b9-e549a8ff257d/waduronazafaxijibigusupid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72023405-cdd3-43ca-8df2-723d75e7290c/29852786578.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b744197-bd72-4ede-9a41-37de3f73a965/bible_trivia_questions_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0053e58-cfb7-4958-8059-8dc5b49e64ee/division_fractions_word_problems_6th_grade.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_off0000e3cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CF 4968 bytes
SHA-256: 358ffd47d44ddb09acbf9e7d406ea6b9f1ed3f0fe71563d2bf9e5d48ea7a598c
font_01_sfnt_off0000f4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C6 11280 bytes
SHA-256: 9e0ec5483be5e073d1f0dd21fb86a0ffed48f841a06c1fa8f086a06f4a4c8ca6