Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bd4bd29004ff1c7…

MALICIOUS

PDF

80.2 KB Created: 2021-02-15 23:32:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d78e2a9968f29b60034a3a1297c13e6a SHA-1: a83c5f951f29c08ebe8dd26ae5bf3bef6aeaccb1 SHA-256: 8bd4bd29004ff1c766d53fde4dc110741a8ad139624df46195097b2991521707
244 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs pointing to external PDF documents, many hosted on disposable domains. One critical heuristic indicates a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://crophysi.ru/strik?utm_term=sjcam+sj4000+wifi+firmware+v1.8 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4466673/normal_5fd857e5b17c9.pdfIn PDF document text
    • http://fionainthefield.org/latest_android_version_for_samsung_galaxy_j7rpkhp.pdfIn PDF document text
    • http://leqqurint.online/fimutosunubenemadao7un5.pdfIn PDF document text
    • http://scm03.ru/xigawirr2kr0.pdfIn PDF document text
    • http://car-test.pro/77436573077ptvkw.pdfIn PDF document text
    • http://rerubin.space/fifty_shades_freed_full_movie_downlo7tej8.pdfIn PDF document text
    • http://webcam-model.online/guyana_west_indies_weather_reportnwf3l.pdfIn PDF document text
    • https://wawupibinotab.weebly.com/uploads/1/3/4/9/134900246/4424362.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427501/normal_600f87a6e4c90.pdfIn PDF document text
    • https://lowonuve.weebly.com/uploads/1/3/4/5/134584544/tofuzakegupeguti.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462341/normal_60069fe5ccd61.pdfIn PDF document text
    • http://claire-irk.ru/purosolokugzn28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501054/normal_600b004d84d0a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475209/normal_5fe0ecdad4e6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469841/normal_5fda53095b2ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482617/normal_5fd8100c5575d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87C 5836 bytes
SHA-256: 38bfaacc835b06a8849ed351de68c69983c38a4e0ba2c7854fead0b27ee33e24
font_01_sfnt_off00010c71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C71 11584 bytes
SHA-256: d67269a1c7698cbffa5de33052c0c134368a90bcd8468f43e17c44f6b1cb6f22

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