Malicious PDF — malware analysis report

Static analysis result for SHA-256 71979216f255990d…

MALICIOUS

PDF

66.9 KB Created: 2021-02-16 13:30:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 4ea7fc7372dc524e290882ec4189a4d8 SHA-1: 04b6ebf1c6fc81bc6c54329aca3760c74335f9e9 SHA-256: 71979216f255990ddc380855ab34543d2d3c50e2d602988c10dd3a7f3fd2baaf
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate maliciousness, specifically phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to a 'service kit'. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing campaigns.

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://druttle.ru/strik?utm_term=service+kit+sportster+883+a+1200 PDF link annotation
    • https://pegufozexak.weebly.com/uploads/1/3/5/3/135317465/perusabozabevox.pdfIn PDF document text
    • http://daliadiago.com/114349616098388t.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487184/normal_5fcf040c5e14c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456676/normal_6017ac868c787.pdfIn PDF document text
    • http://goldstein.berlin/40839914039x3nvy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450351/normal_602493d08a9ab.pdfIn PDF document text
    • http://drilltech.info/bulurutibemuvisaiw0z2.pdfIn PDF document text
    • http://dimax-matrasy.ru/darwin_descent_of_man_onlinep19j2.pdfIn PDF document text
    • http://silikidabog.22web.org/45510687778.pdfIn PDF document text
    • http://storedubai.shop/gesuwaxigego240hl.pdfIn PDF document text
    • https://ronenajawewaxiw.weebly.com/uploads/1/3/4/5/134594127/2157259.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482424/normal_602840a87db86.pdfIn PDF document text
    • http://onatural.space/50_sombras_liberadas_hbolig18.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449014/normal_6004410616fb8.pdfIn PDF document text
    • https://serutoposax.weebly.com/uploads/1/3/5/3/135398922/8114479.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wigezenefibi.epizy.com/world_famous_buildings_and_their_architects.pdfIn PDF document text
    • http://tulazupuvive.epizy.com/shield_logo_wallpaper.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_off0000c620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC620 5808 bytes
SHA-256: 93279e000c0ae805d27f3ab14d026d455459458c04f7a64b07fa5b1d835f7975
font_01_sfnt_off0000d9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FF 10700 bytes
SHA-256: 21420a242c3e9f212816a6dfd54f1fe898818e49d1d3d1aa68db8fa4442a3985

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