Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a21286348141cb4…

MALICIOUS

PDF

143.8 KB Created: 2021-04-06 14:26:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 29460113d40d413cf34a46a617692d1c SHA-1: c3dfd3575b1e7707af6ac23ed3bd8ff050b53fe6 SHA-256: 7a21286348141cb4da0e595cee1d8d50ccfb642a60b6ea9f147d88c90ca613ee
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The embedded URLs suggest a tactic to manipulate search engine results or lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/award?keyword=the+ancient+cities+of+the+new+world+pdf PDF link annotation
    • http://jowafunaneb.iblogger.org/49862922847.pdfIn PDF document text
    • https://wamukefak.weebly.com/uploads/1/3/5/3/135324497/ac06edcfa1b.pdfIn PDF document text
    • https://pojekemo.weebly.com/uploads/1/3/4/4/134469054/18eed0e6b3cc0.pdfIn PDF document text
    • https://vetasokimatajed.weebly.com/uploads/1/3/5/2/135296406/3586430.pdfIn PDF document text
    • https://gunobapeve.weebly.com/uploads/1/3/4/7/134706327/fisimot.pdfIn PDF document text
    • https://fugejifok.weebly.com/uploads/1/3/4/1/134132056/9765055.pdfIn PDF document text
    • https://dawukobisoxewi.weebly.com/uploads/1/3/4/0/134040495/rojikakuzo.pdfIn PDF document text
    • http://zajapokel.22web.org/52587091723.pdfIn PDF document text
    • https://lupagizan.weebly.com/uploads/1/3/1/6/131637074/sojikidupab-pegovamubonafad.pdfIn PDF document text
    • https://mejotozoferu.weebly.com/uploads/1/3/4/8/134866749/2a406a81f24ab.pdfIn PDF document text
    • https://makogoporuri.weebly.com/uploads/1/3/4/8/134868573/5120401.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8c330184-3457-40de-b162-e34763a77ed1.filesusr.com/ugd/0aae61_c3d0fd50ceb4430e968df54e6665ba84.pdf?index=trueIn PDF document text
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_3dd03247df34476dab34e1fc0f22331c.pdf?index=trueIn PDF document text
    • http://lawuzuzadi.rf.gd/schema_d_amplificateur_de_puissance.pdfIn PDF document text
    • https://a2ae8793-a99f-480d-a3bc-849ef63d34f7.filesusr.com/ugd/cc207a_6c9300a2b8dd4acfb99ddd419c4f7646.pdf?index=trueIn PDF document text
    • http://gefureguk.epizy.com/learn_to_dance_videos_free.pdfIn PDF document text
    • https://42cc6f6d-9125-48bc-bce4-1bf15f49b1be.filesusr.com/ugd/7c30af_3a8ea42a1b024d808322230ebcdd1d9e.pdf?index=trueIn PDF document text
    • http://tufelorit.rf.gd/calcium_channel_blockers_drug_list.pdfIn PDF document text
    • http://telatizug.epizy.com/bartow_county_water_quality_report.pdfIn PDF document text
    • https://dd7ee03d-3646-4e01-a1e1-4c0a7e2c9e57.filesusr.com/ugd/d7ba0f_111234b9cff9471bb0c25aff9a32eeb2.pdf?index=trueIn PDF document text
    • https://2a4c341d-9af7-4f89-b48a-1b926ad6ced7.filesusr.com/ugd/dd6616_9c37019a67444b45bc8e31a7476bd114.pdf?index=trueIn PDF document text
    • http://befugoj.epizy.com/ziranepagogawoter.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_off0001f159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F159 5284 bytes
SHA-256: f9f2fb9f48af7075622c605125649b68b7cae21e2d366d187c3544eb665e08ca
font_01_sfnt_off0002035d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2035D 13920 bytes
SHA-256: 1d774ff8565c11cdbfc23ee02841e46ae4ed6a14724650be0d4dc061cddc9009