Malicious PDF — malware analysis report

Static analysis result for SHA-256 61d04d33ca65f2a4…

MALICIOUS

PDF

79.7 KB Created: 2021-06-01 20:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 13f98adb6b136ce60faa351dfc8e2696 SHA-1: 2a89d5b07ec3e88c2f75a2e96520794186ffb708 SHA-256: 61d04d33ca65f2a4bdac6bfaee9bf4dec09dc3b02ba93bde4bba75d907b26907
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or SEO spam. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://archism.ru/pbw?utm_term=bridget+moynahan+real+height PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4463830/normal_5fcc7e8422f4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424025/normal_60242e834f261.pdfIn PDF document text
    • https://nofakefol.weebly.com/uploads/1/3/4/3/134341926/3dcb642a16bfc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388412/normal_5fced7a18e9bb.pdfIn PDF document text
    • https://tovujevimus.weebly.com/uploads/1/3/7/5/137512848/7883719.pdfIn PDF document text
    • https://gipurafesab.weebly.com/uploads/1/3/1/6/131637457/vokuvujew.pdfIn PDF document text
    • https://saxetesaw.weebly.com/uploads/1/3/5/3/135301220/gabesesuvevenafamu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391611/normal_5fd71c9e8f14a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501041/normal_605f3ea691f3c.pdfIn PDF document text
    • https://mekasirizi.weebly.com/uploads/1/3/5/3/135325166/vadurefepime-bujupobumu-mimureb-fesatevudorev.pdfIn PDF document text
    • https://mubojage.weebly.com/uploads/1/3/4/3/134377346/mulixixof.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414852/normal_6002edf349ace.pdfIn PDF document text
    • https://duguzimelape.weebly.com/uploads/1/3/4/6/134666192/nufodo_wupuza_vetewevelesuv.pdfIn PDF document text
    • https://sitasujo.weebly.com/uploads/1/3/4/8/134876827/lidufomolose.pdfIn PDF document text
    • https://tidevaxapoled.weebly.com/uploads/1/3/5/9/135971763/4b46b5097b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369936/normal_5fca3cd6791c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375514/normal_602f850f63f4f.pdfIn PDF document text
    • https://filuramaz.weebly.com/uploads/1/3/4/3/134314207/5021936.pdfIn PDF document text
    • https://gakulenem.weebly.com/uploads/1/3/1/4/131437742/vabakoniperoduw-govofep.pdfIn PDF document text
    • https://mufogijagojar.weebly.com/uploads/1/3/1/0/131070489/f0b587fb077350.pdfIn PDF document text
    • https://dakilemuvepin.weebly.com/uploads/1/3/5/9/135963620/9891720.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/4eeadcac-0612-4fd4-8684-59e618c66697/botaras.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4869407-40cf-4686-a2cd-4723abe4b5c4/coleman_catalytic_heater_wick_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/668cbc9e-12c3-4ea3-a17a-2b41b412b952/mejor_parque_atracciones_mundo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e330697e-d365-4916-93b2-3fd692474ef1/zabefemirufaniza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b24de61-866c-47eb-8734-0b90643f0c72/motorola_sl7550_programming.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_off0000f9ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EA 5212 bytes
SHA-256: 06fce5ced365f0a85a1561dbc0e9a429f149760f56ac0fdb1aca51637a2469b2
font_01_sfnt_off00010b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7E 11164 bytes
SHA-256: 06bad5bbe59b1b487fca2d42ccda0b23ef7f99e04f1e3ba67dc301f4e45d2a40

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