Malicious PDF — malware analysis report

Static analysis result for SHA-256 61ad206c9657e85b…

MALICIOUS

PDF

75.5 KB Created: 2021-05-29 22:35:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 9ffd59ef9f27a5226205977efd22c2c9 SHA-1: 53fa786aeccd981f30446d37e86527af65698b98 SHA-256: 61ad206c9657e85bf44f02eb0d45e3b5e84b63e0d8b3b50274d86917326c8e13
194 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://jumiwimov.ru/123?utm_term=serum+beta+hcg+report PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376125/normal_603f23b59c664.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463266/normal_5fe47f5eba085.pdfIn PDF document text
    • https://nagozexifetuli.weebly.com/uploads/1/3/4/3/134340384/xoxagisarewo.pdfIn PDF document text
    • https://detaliwaka.weebly.com/uploads/1/3/4/3/134340587/330699.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454289/normal_60055966e8bc7.pdfIn PDF document text
    • https://perelixaji.weebly.com/uploads/1/3/4/8/134881923/timofipivizolevit.pdfIn PDF document text
    • https://jovegubegatok.weebly.com/uploads/1/3/5/3/135318826/1714817.pdfIn PDF document text
    • https://dobuxavebixeli.weebly.com/uploads/1/3/4/7/134725246/gewigiw.pdfIn PDF document text
    • https://vejugowe.weebly.com/uploads/1/3/4/5/134506523/lizomaferum.pdfIn PDF document text
    • https://daxekofaji.weebly.com/uploads/1/3/1/6/131606395/boluzukasi-dufivagidi-vemive-faloxofakitudi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499635/normal_600b20e902104.pdfIn PDF document text
    • https://jifafaxima.weebly.com/uploads/1/3/1/8/131871415/88f230ea2963790.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/03ed51a5-efd6-4605-b763-99ed625034ba/how_to_adjust_tough_solar_illuminator_watch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dfe3c28-4352-48c6-8e81-04e1542ae8d8/what_are_typical_behavioral_interview_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/277cbf49-8851-4e0b-87cd-8971453112af/el_conocimiento_silencioso_carlos_castaeda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17f92937-ca0e-4063-8fc5-bf659eb6a4db/60410398447.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aae108db-52ee-4af2-8cd5-2751c404e620/twilight_the_official_illustrated_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e44f2308-b733-4746-8bc0-2995b69d6d3c/xuroxutevuvadovip.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_off0000ea56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA56 5380 bytes
SHA-256: 4227019d0de5b2aa20a0b572ef119daf4a38d6d1821c56ff6cad9777a5ee155a
font_01_sfnt_off0000fc76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC76 10884 bytes
SHA-256: 663b108841d27ca28ddc04df51a22095481e2b63ecfba214adc6316cb50cadb3