Malicious PDF — malware analysis report

Static analysis result for SHA-256 731e33fe20e96b6e…

MALICIOUS

PDF

79.7 KB Created: 2021-03-19 12:20:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 2b2ad7ba754d009c52aca5d6ac1de3a5 SHA-1: 22be60951472f6caaa5548595303fb8db79189f7 SHA-256: 731e33fe20e96b6efad42f6983c41fa1ed844000d2c5f42e20b64e202e95427b
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via the linked content. No scripts were extracted, but the PDF structure itself is indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://fokemale.ru/123?utm_term=chalkboard+font+style PDF link annotation
    • https://zopojezumaze.weebly.com/uploads/1/3/1/6/131637354/79efbdb.pdfIn PDF document text
    • https://vubeluzuge.weebly.com/uploads/1/3/4/3/134357782/vatejovo.pdfIn PDF document text
    • http://lolebunefa.iblogger.org/canape_recipe.pdfIn PDF document text
    • https://filavemegu.weebly.com/uploads/1/3/4/8/134883773/meweribu_vujedinif.pdfIn PDF document text
    • https://tuvaruwa.weebly.com/uploads/1/3/4/7/134711775/2382101.pdfIn PDF document text
    • https://vanufutalolu.weebly.com/uploads/1/3/1/1/131164160/nazazaluriluxel-vezepen-raredatamuri.pdfIn PDF document text
    • https://zekorawuj.weebly.com/uploads/1/3/4/8/134862422/728186.pdfIn PDF document text
    • https://maxafusisiwesu.weebly.com/uploads/1/3/4/6/134688878/291d1.pdfIn PDF document text
    • https://jutabuja.weebly.com/uploads/1/3/4/6/134666284/7658132.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mezigozogug.rf.gd/fufiz.pdfIn PDF document text
    • https://952d9f4b-853a-4e85-af28-23c4d489d487.filesusr.com/ugd/8db125_e4c73e5353fb4c56ae6266e52ec8e698.pdf?index=trueIn PDF document text
    • https://0491f86b-060d-4f4a-be23-b0d01488777f.filesusr.com/ugd/faa7ef_7fea76d6fbfc4abb8d692d157a56b48a.pdf?index=trueIn PDF document text
    • https://4cd5a77a-be8d-44ba-8952-4177873115c4.filesusr.com/ugd/930050_bf6ee4c23daf4f27ba9c2dc7b5ee0e50.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/nepupodixuwujevaz.pdfIn PDF document text
    • https://034618a9-9b39-4f41-ad18-95bca1d1c80b.filesusr.com/ugd/48d9a1_12a0a81b9902495ca5f21694545c91e2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/banula/71138127845.pdfIn PDF document text
    • http://wufalejopasedor.epizy.com/how_often_should_i_take_braggs_apple_cider_vinegar.pdfIn PDF document text
    • https://dcc20dec-0195-4543-b617-cfb82efd15f0.filesusr.com/ugd/30ea26_9ac3e576b58f41599c92614620da33e0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zedudo/47931748687.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/demob.pdfIn PDF document text
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_e0c5f415b12a40238c8a83099efc6dd6.pdf?index=trueIn PDF document text
    • https://089130c0-62ae-4bf1-a93c-656440fe8451.filesusr.com/ugd/738632_51c1f45574fa471eae9bfc8875970422.pdf?index=trueIn PDF document text
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_527ee0359a8c4135a8847c6aec7c6d6f.pdf?index=trueIn PDF document text
    • https://e31b828f-dd5d-4b35-abba-5777d5fc2ed6.filesusr.com/ugd/56a8cc_8bd3b62730444036bda9519f0d10ce88.pdf?index=trueIn 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_off0000fa3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3D 5204 bytes
SHA-256: 6af420ba52b4f6ca8e11d70d4bad19a2371cd0c3d45a7c452c151dbd486a0540
font_01_sfnt_off00010be8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE8 10848 bytes
SHA-256: f4b21955e4b42e18521ece0f0b7775b4cb41d7a7b6449f9333ccadcf373fdcfe