Malicious PDF — malware analysis report

Static analysis result for SHA-256 6556d45648445e7a…

MALICIOUS

PDF

78.1 KB Created: 2021-04-10 11:27:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a525f46e409e62f32bd31df94e8b3f9d SHA-1: e00906f93b17d000f493deaf989fb76f55feb3ac SHA-256: 6556d45648445e7a6420695b986abfa9ebadd2042ca28f4d13b8c4e15ee8d4a0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated, suggesting a link farm or SEO poisoning tactic. One of the primary external links points to 'bologen.ru', which is likely a phishing or malware distribution site. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=is+hbo+max+on+firestick+reddit
    • https://wepulawako.weebly.com/uploads/1/3/4/0/134096509/66ebf.pdf
    • http://senenetikoxikom.22web.org/anne_marie_live_performance_rockabye.pdf
    • https://cdn-cms.f-static.net/uploads/4365628/normal_6031467eccf58.pdf
    • http://wuzubofetaxoger.iblogger.org/26159473670.pdf
    • https://kopujigok.weebly.com/uploads/1/3/4/8/134862339/kebosixajo_pitubirebupi.pdf
    • http://zarujosusaxom.22web.org/system_analyst_meaning.pdf
    • https://jomokojexenubi.weebly.com/uploads/1/3/4/8/134877089/8891425.pdf
    • http://xenuven.22web.org/butunobob.pdf
    • https://xidoteruredogon.weebly.com/uploads/1/3/1/4/131454367/1801170.pdf
    • https://cdn-cms.f-static.net/uploads/4409840/normal_603f303769263.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tufitijinexu/93809092206.pdf
    • https://s3.amazonaws.com/zetubakuz/architecture_patterns_in_android.pdf
    • https://s3.amazonaws.com/gosete/vampire_diaries_season_1_plot_holes.pdf
    • http://wafovekideg.rf.gd/jikirox.pdf
    • https://s3.amazonaws.com/kagedatabujo/gondang_batak_simalungun.pdf
    • http://zepenolewiri.epizy.com/christmas_pictures_images_free.pdf
    • https://s3.amazonaws.com/mukut/92419387820.pdf
    • https://s3.amazonaws.com/tokafanawa/cuales_son_los_signos_vitales_en_embarazadas.pdf
    • http://tawowajukamabel.epizy.com/android_fragmenttransaction_replace.pdf
    • https://s3.amazonaws.com/gewuwasi/ziloxiwazazudunetifo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2ef.bin
3cffed2f7a2259aa019ec0965a4f644a792d483744b6fa2512b8cc1db60cca94		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EF 5436 bytes
font_01_sfnt_off00010542.bin
a694cb310958ceb1e7c15bc77ff8542098ebdd1ff5ab13732d8df10b8727c8f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10542 10972 bytes

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