Malicious PDF — malware analysis report

Static analysis result for SHA-256 191e3cf4651fa384…

MALICIOUS

PDF

80.3 KB Created: 2021-03-15 02:04:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 8e9ef07f626b5d4173b5037ff1f6bc7d SHA-1: 22f3310c67d8d47086522f7fccf6f6ef675c52a4 SHA-256: 191e3cf4651fa38469f71858729ae3c28a94d6287765d9a12311b299564e54f8
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, and one embedded URL that redirects to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://mezovuduw.ru/strik?utm_term=john+deere+2650+hydraulic+pump PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453556/normal_5fe90f7493244.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421040/normal_6006f2b9c136f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490129/normal_60432bfea252f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475572/normal_60086dca3e81f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377931/normal_5fd7835d88bbf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391315/normal_60336bed17f85.pdfIn PDF document text
    • https://zuxusesomopekem.weebly.com/uploads/1/3/5/3/135305840/c8701c4bbaec5.pdfIn PDF document text
    • https://poximixej.weebly.com/uploads/1/3/0/7/130776069/8119157.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504568/normal_601d5158f1468.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368223/normal_602ef6a419f46.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420752/normal_5fc98dda0b074.pdfIn PDF document text
    • https://vugevosuza.weebly.com/uploads/1/3/5/3/135328642/5494530.pdfIn PDF document text
    • https://pasironukid.weebly.com/uploads/1/3/0/8/130814081/1568148.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380869/normal_5ffb668b69ea3.pdfIn PDF document text
    • https://nirumoxizexajiv.weebly.com/uploads/1/3/4/5/134524745/644396.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5cbbff6b-7c47-4fbb-abda-9de5069fbc88.filesusr.com/ugd/1a89c8_becca55f61a146b2929ba0165b84ddd1.pdf?index=trueIn PDF document text
    • https://ed7c5604-ec0f-4ae6-9d22-6d534b57d154.filesusr.com/ugd/1d5a3f_b69def493d63445e9d660c87624a1269.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/sc_hunter_ed_course_answers.pdfIn PDF document text
    • https://a179b4bb-f9e1-4b0b-8685-f881d2afde68.filesusr.com/ugd/0fdb6d_c2346b046b634bc0a0573c16bc7f073e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pazovugal/airline_pilot_uniform_suppliers.pdfIn PDF document text
    • https://16e729f2-8c5c-4787-b670-14aeba6c5e03.filesusr.com/ugd/ac55e2_155abdea48544df7b2e1a235aea3303e.pdf?index=trueIn PDF document text
    • https://d33b8dfc-9792-4d26-9d81-613d0bd32a71.filesusr.com/ugd/d34367_31096a207dc245b789f51a3e6294a1ec.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vudivuzakal/9070075635.pdfIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/99972201307.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_off0000f9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F4 5776 bytes
SHA-256: 139037a4346e05e8620c67f7ffd7fb5cf493b5ddc82fc1170b16bee24b3e1a49
font_01_sfnt_off00010d7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7F 11108 bytes
SHA-256: 90c38f43f0b9c0b4b9921f82769d5f46de8a31545d24d607275d4469d671bc91