Malicious PDF — malware analysis report

Static analysis result for SHA-256 891062a805116575…

MALICIOUS

PDF

69.0 KB Created: 2021-02-13 20:33:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 41d0b681630b66b9fd9d61bd8711c9b3 SHA-1: 98f61bede1893a132e9c97361b79eb1334ceff51 SHA-256: 891062a8051165750f25bda6956666dc59f8263c2aa514497766a63bbc1a47fb
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 hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified this as malicious, specifically a phishing trojan. While no scripts were directly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/aws?utm_term=twitter+lite+apk+apkmirror PDF link annotation
    • https://luxoxika.weebly.com/uploads/1/3/4/8/134899107/pubaf-rumodezarunanol-dowab.pdfIn PDF document text
    • https://xemexetizepe.weebly.com/uploads/1/3/6/0/136094173/bakatu_vimozupeme.pdfIn PDF document text
    • http://sudiwemubitep.22web.org/81080942070.pdfIn PDF document text
    • https://gatojodegapov.weebly.com/uploads/1/3/1/6/131637656/8019668.pdfIn PDF document text
    • https://xelipifexejup.weebly.com/uploads/1/3/4/8/134848770/gimijabunub.pdfIn PDF document text
    • https://cdn.sqhk.co/gitovera/gcvOjie/troll_face_quest_internet_memes_level_21.pdfIn PDF document text
    • https://sedeberelaniku.weebly.com/uploads/1/3/6/0/136030724/d3fc6b0b2.pdfIn PDF document text
    • http://ruperamumafuvaz.22web.org/8654343608.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/fosawef/bubble_sheet_mask_sugu.pdfIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/dm_guidelines_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/chandrayaan_2_isro_information_in_english.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD113 4892 bytes
SHA-256: 10f9f75e4a9150daf3c070fe5115bd1e0a4c5f23ccc71f3ccf6a90bd86211521
font_01_sfnt_off0000e1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B5 11128 bytes
SHA-256: 7c55cded80263f54b98003207a492d66b62b13c2d99f9bee0c447cf758f6da3b

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