Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d4b3a3840ca2018…

MALICIOUS

PDF

74.7 KB Created: 2021-04-04 04:39:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 311602e014f53e9aa389bab3639ebbaa SHA-1: 9eff722c7ea3eed0222d356d322fe2ed92d1cb8a SHA-256: 4d4b3a3840ca2018da42c0dcff2f84dd1e283164e73e9af38d0c98f46c5933e5
186 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of malware. It contains a large number of external links, suggesting a link farm or SEO manipulation tactic, with one URL pointing to a potential redirector. While no scripts were explicitly extracted, the presence of external links and the overall detection profile strongly suggest the document is designed to lead users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://lozipotod.ru/wix?keyword=smoky+hill+high+school+finals+schedule PDF link annotation
    • https://datodorigagage.weebly.com/uploads/1/3/4/6/134697486/gimozutewun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388169/normal_603450e718ee5.pdfIn PDF document text
    • https://simiwulizolur.weebly.com/uploads/1/3/1/4/131455232/nutexok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477637/normal_60388b7214d10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373243/normal_5fc9de374ad91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416939/normal_5fe6c66a0caeb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382627/normal_5fc7962da7829.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427783/normal_6016c83a99dca.pdfIn PDF document text
    • http://pl50off.info/ruwajagiposn123y.pdfIn PDF document text
    • https://jovopunok.weebly.com/uploads/1/3/4/8/134869647/2446424.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459776/normal_5ff1d60d2f9b1.pdfIn PDF document text
    • https://pixizibonemitu.weebly.com/uploads/1/3/1/3/131382366/vajomokaxodo.pdfIn PDF document text
    • http://55571.ru/415661140075a5e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478393/normal_604e4be3d0bc7.pdfIn PDF document text
    • http://giveaway2020.info/zuripozd2nod.pdfIn PDF document text
    • https://lozugukavokukes.weebly.com/uploads/1/3/4/3/134357100/2266945.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/cambria_math_font_free_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86048de6-3026-41c1-b345-a8b501a67ee6/sonifigovexe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65a39235-0757-4627-a7c1-7aaae1418402/85752950902.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/suvuwufawononobetobexo.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/msi_760gm-p34fx_manual.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_off0000e467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE467 5608 bytes
SHA-256: 58b68290de95ac171defc255439d7324752f8d8d8d56dd35e3735221a7dcac7d
font_01_sfnt_off0000f769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF769 11008 bytes
SHA-256: 64d718ebfc0381ba555df6a1378d87e1f1ab0e393e7dd950204fe0ad16612ab9