Malicious PDF — malware analysis report

Static analysis result for SHA-256 19e6e8764d315f50…

MALICIOUS

PDF

74.3 KB Created: 2020-12-17 06:41:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8a481d72567456c947f5ab27cb03774c SHA-1: 0d8105b696324b796c1de488d5317bad5e33e13b SHA-256: 19e6e8764d315f509fccaa22ae1722b65b8c2ac5155481f28efb264f22b53484
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a significant number of external links, characteristic of a link farm used for phishing or distributing further malware. The presence of multiple disposable hosting domains and UTM parameters suggests an attempt to obscure the final destination and track campaign effectiveness.

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://trafftec.ru/strik?utm_term=rs+medium+clue+scroll+maps PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403822/normal_5f93dec39ce67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374696/normal_5f9ab61ae05f5.pdfIn PDF document text
    • https://temegefa.weebly.com/uploads/1/3/4/5/134583031/9b8c45e386.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366620/normal_5f91c8bd8e911.pdfIn PDF document text
    • https://gurewuba.weebly.com/uploads/1/3/4/8/134892349/rasalaguxuli-nusaremaler.pdfIn PDF document text
    • https://bunofavaluz.weebly.com/uploads/1/3/4/6/134661637/706562.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383916/normal_5fbf0dbecabec.pdfIn PDF document text
    • https://sakixuso.weebly.com/uploads/1/3/4/4/134488330/buvun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388060/normal_5f9202babae14.pdfIn PDF document text
    • https://lurefeti.weebly.com/uploads/1/3/4/6/134683691/lenukafi.pdfIn PDF document text
    • https://nudiwosesi.weebly.com/uploads/1/3/4/3/134317077/99592645a3c64d.pdfIn PDF document text
    • https://lopamazaveseku.weebly.com/uploads/1/3/4/6/134643240/5591897.pdfIn PDF document text
    • https://fakoronad.weebly.com/uploads/1/3/4/7/134712901/sizobe.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/zuguvoxoki/android_9_samsung_j3_2016.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD136 5228 bytes
SHA-256: c1805979e2486da15d662b2292596f8b4cbcdc1186c0afbc4cf8f1397cc7bb49
font_01_sfnt_off0000e2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E6 10404 bytes
SHA-256: 2b0a0916397f3f9b57feb82d543a442f96c2e3093ed653334890c9f43a63a9f5
font_02_sfnt_off000106d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D6 16140 bytes
SHA-256: 2732c78df68b4531e26da51a256f0f9ab881cb8a96d1886ade34872d88eeece3

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