Malicious PDF — malware analysis report

Static analysis result for SHA-256 be4b965c1f1884f7…

MALICIOUS

PDF

76.7 KB Created: 2021-03-29 02:39:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f62e06a23f348476cb05ec93943918ca SHA-1: a93d27b9a0dad3784217a671d85e0e53ff6794d6 SHA-256: be4b965c1f1884f72962bc7070b49ee7b98ae59a05816e2ecd630e8800e2d563
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document identified as malicious by an ML classifier and heuristic rules. It functions as a link farm, containing numerous embedded URLs that point to external websites. Several of these URLs are associated with known malicious redirectors or disposable hosting, indicating a potential for phishing or malware distribution. The document body appears to be malformed or truncated, preventing a deeper analysis of its specific content or intent beyond its role as a link aggregator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/123?utm_term=a+sample+goat+farming+business+plan+template In PDF document text
    • http://lokotahas.ru/how_much_does_child_care_assistance_payj6ibw.pdfIn PDF document text
    • https://cdn.sqhk.co/jozazixefuf/gi4d1QW/73101807271.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471484/normal_60072073f1c8c.pdfIn PDF document text
    • https://cdn.sqhk.co/moxoxitij/fLifidk/german_truck_simulator_2010.pdfIn PDF document text
    • http://xepidenad.scienceontheweb.net/rain_dial_manual_run_all_stations.pdfIn PDF document text
    • http://winoorama.site/40752067150eu3md.pdfIn PDF document text
    • https://cdn.sqhk.co/mirusopujame/jhpT5Lh/pacman_power_pellet_ghost_costume.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366665/normal_5fcdba0903208.pdfIn PDF document text
    • http://perfectiona.online/stihl_ms250_owners_manual55zzk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452381/normal_5fd350ff58ce9.pdfIn PDF document text
    • https://cdn.sqhk.co/pijuvedozuw/qDggjoC/86173923858.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485445/normal_602ef1d706cd6.pdfIn PDF document text
    • https://cdn.sqhk.co/kifavubivelo/chcidgf/pibinu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://26aaa629-0581-4e25-ae32-a194504e59ab.filesusr.com/ugd/2d4e87_3fc4298ec98f4dd4926532b3af604dbf.pdf?index=trueIn PDF document text
    • http://nivuzujanux.myartsonline.com/canela_de_velho.pdfIn PDF document text
    • https://7f3356c1-ec1f-498a-9d41-5b36c14d87b7.filesusr.com/ugd/98d33d_c633b11b948c44fb95d0139aa9536384.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fizufapu/childe_harolds_pilgrimage_canto_1_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/nibolesibipoxomeguw.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_off0000efa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA6 5348 bytes
SHA-256: c2e968518d829d4963d6ff3d65ce688f6dcff0f7226886c3f86e44b869c86cbb
font_01_sfnt_off000101bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BD 10540 bytes
SHA-256: b7893a2d8d8009bebffa509db05cd6db3ef16e3d746ed031dbea731bac01f803

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