Malicious PDF — malware analysis report

Static analysis result for SHA-256 88ea96b9b903e463…

MALICIOUS

PDF

76.4 KB Created: 2021-02-22 17:17:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 955eaa9a3812b42af6d5050f42df09d5 SHA-1: 378efef4263145996a9f302ac1b5f02881acca2b SHA-256: 88ea96b9b903e46324be938838b9384d992591571c2cfe433273170eb30a4265
186 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan variant. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains references to software downloads, indicating a lure for users seeking specific applications.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://bologen.ru/123?utm_term=simcity+4+deluxe+edition+download+mac PDF link annotation
    • https://tetejinuditobig.weebly.com/uploads/1/3/5/9/135973847/2660758.pdfIn PDF document text
    • https://kofudavobew.weebly.com/uploads/1/3/4/6/134602163/6c0a29fa491.pdfIn PDF document text
    • http://denizan.com/gadowesondvb07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427080/normal_6026aa7ba534b.pdfIn PDF document text
    • http://leyloften.online/691886391352anbo.pdfIn PDF document text
    • https://nerapusu.weebly.com/uploads/1/3/1/4/131438180/guvavi_medesigafet_zotesesiranol_fojugavurodinen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451555/normal_600c69532566e.pdfIn PDF document text
    • https://vowabogebem.weebly.com/uploads/1/3/0/7/130775978/balit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412606/normal_5ff063d1f401c.pdfIn PDF document text
    • http://bitcoins-profits.com/74148501644x87mg.pdfIn PDF document text
    • https://jupavovol.weebly.com/uploads/1/3/4/3/134314217/loroxedujimofok_rowuvitabeg_zedapefosumot_sikag.pdfIn PDF document text
    • https://mikezibe.weebly.com/uploads/1/3/1/4/131453119/17e76.pdfIn PDF document text
    • https://gilurabad.weebly.com/uploads/1/3/0/7/130775641/8634273.pdfIn PDF document text
    • https://vosanuxavuzom.weebly.com/uploads/1/3/6/0/136089669/8729664.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/wesezuzuvalirik/border_movie_bhojpuri.pdfIn PDF document text
    • https://s3.amazonaws.com/safago/75976216636.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/wow_legion_argus_guide.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_off0000e837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE837 5264 bytes
SHA-256: b8da541faf9fae6df93c0f7669c9c21c6fe17127262faf8fcd23292993006d6c
font_01_sfnt_off0000fa33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA33 12424 bytes
SHA-256: 9557ec71474709bb272c93f374071ed487f493c9289bb37f4117198c588da2c3

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