Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bc9f8cbc679719b…

MALICIOUS

PDF

67.4 KB Created: 2020-11-16 23:08:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d2de274879efe60879efcee975eacf03 SHA-1: d2d311717e58b7164f9e2bd355a1b809f51733f0 SHA-256: 8bc9f8cbc679719b752b49cd66c8891f7d0474220c8c9360186b40584f853c17
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 0.9998

Heuristics 6

  • 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 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://trafficel.ru/123?utm_term=oregon+chainsaw+sharpener+instructions PDF link annotation
    • https://jipidonano.weebly.com/uploads/1/3/4/3/134340070/296cde39.pdfIn PDF document text
    • https://pofisuxix.weebly.com/uploads/1/3/4/0/134016862/763727.pdfIn PDF document text
    • https://kirenokasanav.weebly.com/uploads/1/3/4/4/134445236/fifevowedaz-wonazalin-zimikefokaxa-kefawipisixom.pdfIn PDF document text
    • https://jutulomivepira.weebly.com/uploads/1/3/4/7/134775876/wesuxuxaruguduk.pdfIn PDF document text
    • https://mesipaku.weebly.com/uploads/1/3/1/3/131383407/wukexefesav.pdfIn PDF document text
    • https://tusutaxuwipafu.weebly.com/uploads/1/3/4/4/134403355/2348390.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/b9ac703f-cea2-4e7f-9c6d-c65622b6955e/ziwenorijumawe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcfd3491-64c4-4bad-83c4-bfbf693f76f9/61699517987.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/49193784261.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a77e3111-a189-41dd-ac0f-180ef9c0bab6/dabivafabofem.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/rufaluvipirudapivijalutit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0030542-a990-44c5-8c35-708187e90eda/the_lay_guide_by_tony_clink.pdfIn PDF document text
    • https://s3.amazonaws.com/pizexopenaxu/90021152391.pdfIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/dozijujo.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0D 5284 bytes
SHA-256: a914b0746a4d70206910dcd25afd505bd0a78f353c4454e18e77702af25e01be
font_01_sfnt_off0000df14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF14 9952 bytes
SHA-256: 529f13d4590e3a2674e6d52671246281d50c70ff09bcf2f6a1529e0ca041acff

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