Malicious PDF — malware analysis report

Static analysis result for SHA-256 dde2dc48e4d2d98e…

MALICIOUS

PDF

189.8 KB Created: 2021-03-04 11:10:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 758272720cd75030bb5c114e6dc370c4 SHA-1: 3e4d9cbed8c22e3d4a8490d8ebf735e6d48197d4 SHA-256: dde2dc48e4d2d98e2ad4adf617c7961714166194cd9b0740681ddb520406172c
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous external URIs, many hosted on disposable domains, suggesting it functions as a link farm. The primary external URI, 'https://zajinet.ru/award?keyword=farmall+super+a+steering+parts', is likely a lure to redirect users to malicious content or phishing pages. No scripts were extracted, but the PDF structure and numerous embedded URLs point towards a phishing or malware distribution attempt.

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://zajinet.ru/award?keyword=farmall+super+a+steering+parts PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451545/normal_6015fe363249a.pdfIn PDF document text
    • https://kobirozo.weebly.com/uploads/1/3/4/8/134846370/1f94e931b8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478923/normal_6023584a2099d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366961/normal_60137a67e1073.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480187/normal_5fdac52bb3cb8.pdfIn PDF document text
    • https://xekigumi.weebly.com/uploads/1/3/0/7/130776031/gixowulegumozat.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373755/normal_5fdf9596cd6f4.pdfIn PDF document text
    • http://instacopyrightcenter.com/sensus_water_meter_partsm9ieu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384832/normal_602f34089150b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476437/normal_5fc6dfe84111f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373985/normal_5feb981305826.pdfIn PDF document text
    • https://getenulezawo.weebly.com/uploads/1/3/4/8/134897364/323791ac49.pdfIn PDF document text
    • http://edevletorg.com/66094263474w31my.pdfIn PDF document text
    • http://introdom.ru/winston-salem_aaa_officemme65.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/vajefam/74869762764.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/splash_screen_image_animation_android.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/29959445621.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002a982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A982 2888 bytes
SHA-256: f7c768458a26e9ef562858d01fa00611e0c7310d4e9849af27157a7c321f0ba5
font_01_sfnt_off0002b3c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B3C4 5092 bytes
SHA-256: bfcdbdce578744c17c6678c943f488f13d5be20c79e936821515ca864b29a195
font_02_sfnt_off0002c507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C507 10568 bytes
SHA-256: e57ac0108ffcbcce2ccb420b5891b51f9aff68dceec011464802668a4b8d4d69

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