Malicious PDF — malware analysis report

Static analysis result for SHA-256 fad7899d1a6a107c…

MALICIOUS

PDF

80.4 KB Created: 2021-04-08 23:41:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c0bb1de9273e660db1fddacaaf2f737e SHA-1: 2507dc7b02bd72e1abca737b18871abbca16e8fd SHA-256: fad7899d1a6a107c511980c720e0d91dab08eb6dbef3b71afe4de359eda45eca
146 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and acting as a link farm, which is a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this malicious intent. Although no scripts were explicitly extracted, the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' firings indicate a high likelihood of malicious content, possibly exploiting PDF vulnerabilities to redirect users to the identified URLs.

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://xezojetit.ru/strik?utm_term=inc+and+grow+rich+amazon PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403676/normal_60542432c9b0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448113/normal_5fdc41993e2c0.pdfIn PDF document text
    • https://cdn.sqhk.co/togixulala/OgdC1mw/60997237597.pdfIn PDF document text
    • http://tewosube.mypressonline.com/jisolu.pdfIn PDF document text
    • https://cdn.sqhk.co/kujotukil/LrPiFja/gafidur.pdfIn PDF document text
    • http://dewisazovuvoxi.mywebcommunity.org/miwifepovoxaratarex.pdfIn PDF document text
    • https://cdn.sqhk.co/kitaparek/ghgji04/5981021141.pdfIn PDF document text
    • https://cdn.sqhk.co/xukigipeduve/jCVidib/96056253902.pdfIn PDF document text
    • https://cdn.sqhk.co/joxonorapa/jahidhd/newuwubiwoxeve.pdfIn PDF document text
    • http://gamukanemafutu.mywebcommunity.org/online_to_jpg_splitter.pdfIn PDF document text
    • http://wumomotetidofe.getenjoyment.net/amplificateur_oprationnel_soustracteur.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413231/normal_5fec9b02a9db3.pdfIn PDF document text
    • https://cdn.sqhk.co/neguvobipa/ih6jflh/61170890211.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368767/normal_601df364039d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412174/normal_6059600973780.pdfIn PDF document text
    • https://cdn.sqhk.co/xipepovivik/jjgsmAJ/xoxurek.pdfIn PDF document text
    • https://cdn.sqhk.co/pujixefan/b6M5ajc/78839956839.pdfIn PDF document text
    • https://cdn.sqhk.co/dewavasese/nwJl5jc/hack_games_my_talking_angela.pdfIn PDF document text
    • http://sakulog.sportsontheweb.net/wimavilaxuxotujozosoz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lavapokapajemob.myartsonline.com/distributed_autonomous_robotic_systems.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_off0000fa1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1D 5220 bytes
SHA-256: 7d102b730c2db3cc6e33e6dec2f42fbbeae277c9f8df7b908a63f0deec7ad52e
font_01_sfnt_off00010bd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD0 11644 bytes
SHA-256: a2de9e6570e80e47f354b86647bd9434d1f5ac3b7c1934bb0408c48d7af133d6

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