Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a72e8207dcdf5a3…

MALICIOUS

PDF

74.8 KB Created: 2021-06-02 06:12:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 5add2e6c4b7a4e8ab679947933856a4a SHA-1: 271011818d11d7209ee3580b0cd05ab51903dcb0 SHA-256: 8a72e8207dcdf5a3b34d981fed3cf1cae624e1af51bbd597a93c610ae1316401
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The embedded links and the PDF's structure suggest it functions as a link farm, directing users to external sites like 'inwebjor.ru' which may host phishing content or further malware. Although no scripts were explicitly extracted, the PDF's nature and the numerous embedded URLs point towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://inwebjor.ru/pbw?utm_term=how+long+do+petsafe+rfa-67+batteries+last PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486521/normal_602b284d3fa09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380068/normal_605efbe495264.pdfIn PDF document text
    • https://nunamazo.weebly.com/uploads/1/3/4/3/134311680/xipijubimijipe_ximaforevibejoz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501509/normal_5fdd0367a6787.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417329/normal_5fcf47e8c8977.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408471/normal_5ffa6a4e39ef1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413713/normal_604d1fa43e67a.pdfIn PDF document text
    • https://kupikonawu.weebly.com/uploads/1/3/4/8/134882044/a95b87e5bd93f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443810/normal_606ac2195ff67.pdfIn PDF document text
    • https://takoxoja.weebly.com/uploads/1/3/4/3/134371043/lutalum_nikinuputar_waxalepone.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://duziruromeja.pbworks.com/f/ejercicios_de_ortografia_de_la_letra_b.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fb4db77-c30e-4a99-bf36-cf3d9769f867/seripugezubozas.pdfIn PDF document text
    • http://negaboxa.pbworks.com/f/visogizuzavapubasa.pdfIn PDF document text
    • http://zilebunod.pbworks.com/f/27137088143.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4689e54c-265e-455d-b704-731ee1c64a9e/83693077900.pdfIn PDF document text
    • http://risuxujuvu.pbworks.com/f/xofix.pdfIn PDF document text
    • http://muxopal.pbworks.com/w/file/fetch/144471093/english_alphabet_handwriting_practice_book.pdfIn PDF document text
    • http://tagexoba.pbworks.com/w/file/fetch/144422682/honeywell_thermostat_manual_francais_rth2300b_1020.pdfIn PDF document text
    • http://garigor.pbworks.com/f/kingroot_2020_android_9_pc.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_off0000e400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE400 5668 bytes
SHA-256: aded75438b1b410090ba7164ab7f67ddb3bd2bf7c4b8c45870cdcf2c06c846be
font_01_sfnt_off0000f780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF780 10828 bytes
SHA-256: fd81d20319ad6d1b9189d9488067af484ab2a91ae45271c4e66c25eafb000828

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