Malicious PDF — malware analysis report

Static analysis result for SHA-256 f118409842b20e7a…

MALICIOUS

PDF

84.0 KB Created: 2021-03-03 05:18:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7dee74d6a7d0beeef02dd64157a69e4f SHA-1: e66387ddd6eb6fb9dd2e9d615e25c2557a981eed SHA-256: f118409842b20e7acf69510124721f350757ee33921e1aa244a4ba9b72ce2e47
186 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. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or SEO spam operation. The document body, though partially corrupted, contains keywords related to a 'Stihl leaf blower manual', which is likely a lure to attract users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/award?keyword=stihl+bg86c+leaf+blower+manual PDF link annotation
    • https://naxovemunozi.weebly.com/uploads/1/3/5/9/135958864/69231.pdfIn PDF document text
    • https://cdn.sqhk.co/difixoruze/ShchfyP/soccer_ball_juggling_world_record.pdfIn PDF document text
    • https://pevopuxavinedun.weebly.com/uploads/1/3/1/4/131406680/2091788.pdfIn PDF document text
    • https://cdn.sqhk.co/wafavalufa/zzjwiiM/save_the_world_images_free_download.pdfIn PDF document text
    • http://juzisil.22web.org/kotametepifufun.pdfIn PDF document text
    • https://cdn.sqhk.co/gufojakig/ichchbu/1423_world_class_spirits_gmbh.pdfIn PDF document text
    • http://datulosuwila.iblogger.org/walexagiwinexolesit.pdfIn PDF document text
    • https://dosisusibifoba.weebly.com/uploads/1/3/4/2/134236234/1117222.pdfIn PDF document text
    • https://ginuwawabesinu.weebly.com/uploads/1/3/1/1/131164414/tomunebakivavikirex.pdfIn PDF document text
    • https://cdn.sqhk.co/dupabeket/ieTiiSP/zepowinupabemuwajotubal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390383/normal_600e070c1cd08.pdfIn PDF document text
    • https://xasevezivim.weebly.com/uploads/1/3/5/3/135302984/vakarufe_ruzipurefotas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459329/normal_5ffa577b97fe2.pdfIn PDF document text
    • https://cdn.sqhk.co/kizulajeli/mu7geis/bricks_and_balls_flash_game.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wipedeposadav.rf.gd/bendy_reeces_story.pdfIn PDF document text
    • http://nasewuji.epizy.com/folitifivega.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/guruxifife.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_off00010b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B73 5800 bytes
SHA-256: f84da9fc6f0e427195d22dab0e63b5a4aeeccdfb7e5a16fc8c9fe0f3df8323f8
font_01_sfnt_off00011f2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2A 10412 bytes
SHA-256: aa9be135a628eb9ffc9c9d87200edee528c83c66dd1e242ef7558bcb47776a76

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