Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ba5c85a7008eac0…

MALICIOUS

PDF

73.9 KB Created: 2021-03-24 04:35:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 00c95dacd5812fbf93d39fed24487dd4 SHA-1: 261f624a74c985fa52bdcd8343ff71f77c6d8ada SHA-256: 3ba5c85a7008eac0babc7ee9b0567413cdc9740056f26a970c6d3b33335088ff
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded URLs, such as 'https://maypoin.ru/strik?utm_term=army+leadership+fm+7+22.7', are likely used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/strik?utm_term=army+leadership+fm+7+22.7 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4502833/normal_60533d79ea13b.pdfIn PDF document text
    • https://xozugovapotup.weebly.com/uploads/1/3/1/1/131164024/sezukudojoditum.pdfIn PDF document text
    • https://cdn.sqhk.co/tudosiki/2gdjbge/jebewutudiwet.pdfIn PDF document text
    • https://japekubejur.weebly.com/uploads/1/3/0/7/130775222/d8c060e32a42.pdfIn PDF document text
    • https://wolapegod.weebly.com/uploads/1/3/0/7/130776073/c80426987.pdfIn PDF document text
    • https://cdn.sqhk.co/datolabevev/jahhjg8/fur_elise_full_piano_sheet_music_free.pdfIn PDF document text
    • https://lafitezin.weebly.com/uploads/1/3/5/3/135323108/3283679.pdfIn PDF document text
    • https://ramokazadi.weebly.com/uploads/1/3/4/4/134470245/8754019.pdfIn PDF document text
    • https://xivunububan.weebly.com/uploads/1/3/0/9/130969166/luxisemor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457839/normal_603bcb18e279a.pdfIn PDF document text
    • https://cdn.sqhk.co/xexegapimuwi/ifjjGje/gastric_band_app_reviews.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409403/normal_5ffb9ed0dc0f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451929/normal_6011384cbf8c1.pdfIn PDF document text
    • https://cdn.sqhk.co/wufevinek/Etw7Kge/dragon_farm_airworld.pdfIn PDF document text
    • https://cdn.sqhk.co/tibakekavero/hd1hiQ8/dosol.pdfIn PDF document text
    • https://cdn.sqhk.co/gejupajo/WifiaiL/soccer_rules_goalkeeper_possession.pdfIn PDF document text
    • https://cdn.sqhk.co/xalazuwumi/cce2jhE/60021598583.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9b08d158-0e0f-4203-9b31-e1272d977b1c.filesusr.com/ugd/086daf_7a9bd7493da6485db3ddacf2fc7ac3c8.pdf?index=trueIn PDF document text
    • https://e4da1597-3bb3-488b-9226-7c2c9e06e9ce.filesusr.com/ugd/db5d73_9e7169c575cd4154bd79bfebeb7ba2e7.pdf?index=trueIn 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_off0000e09b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09B 5616 bytes
SHA-256: 9cae0e160337eb098adec95cafcccabeee37b022c1c5cc7301b866764b05d8ae
font_01_sfnt_off0000f39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39F 10928 bytes
SHA-256: 532e33900e724f3648386cf5a0eef269d1fcad4f3ac3eb6e237c4caeb53996aa

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