Malicious PDF — malware analysis report

Static analysis result for SHA-256 44730a304bc03a88…

MALICIOUS

PDF

76.7 KB Created: 2021-02-16 10:20:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: fe85f6c3eae86532bfb7c90dbe7df7ba SHA-1: 4f82060d6a49f7a2f02752e9daaac5cb251b1b50 SHA-256: 44730a304bc03a8826b251f5b740d1b1db9ea6166ff773396977603bf9091749
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics as malicious, including a critical PDF link farm detection and ML classification. It contains a large number of external URIs, with one pointing to 'bologen.ru', suggesting a phishing or malware distribution attempt. The ClamAV detection further confirms its malicious nature, identifying it as 'Pdf.Phishing.Trojan'. The document body is heavily obfuscated and appears to be generated content, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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=is+sulfur+ionic+or+molecular PDF link annotation
    • http://xapefefulonexir.22web.org/formation_plombier_chauffagiste_lyon_afpa.pdfIn PDF document text
    • https://favurujovonelod.weebly.com/uploads/1/3/4/4/134435517/ragukenatotuj-kunaw-femubiliwudumaj-lamatikebuzux.pdfIn PDF document text
    • http://lefuvaguvupawax.iblogger.org/the_cartoonz_crew_nepali_song.pdfIn PDF document text
    • https://sajozigita.weebly.com/uploads/1/3/0/8/130814351/369123ee6.pdfIn PDF document text
    • http://berabujadew.22web.org/68547453821.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/jolituzoji/20655653890.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/les_miserables_piano_sheet.pdfIn PDF document text
    • http://jataluwapimose.rf.gd/bomb_squad_mod_apk_android.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/android_wear_watches_under_10000.pdfIn PDF document text
    • http://gekuvilis.epizy.com/62077146946.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/22201892292.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/38416594674.pdfIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/jason_stephenson_guided_meditation_for_relaxation.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/across_the_universe_full_movie_english.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/handbook_of_inorganic_compounds_perry.pdfIn PDF document text
    • https://s3.amazonaws.com/xezonijida/50007202126.pdfIn PDF document text
    • https://s3.amazonaws.com/nefagolom/vakaxutimadabuno.pdfIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/73621662733.pdfIn PDF document text
    • http://lopogoroje.rf.gd/braso_da_repblica.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/dikomabedoberizeveguti.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/lg_hbs-730_price_flipkart.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_off0000ee46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE46 4964 bytes
SHA-256: 519c297780ee72cd6aeb3a571837c6f3591655be7fc1a700b557cf3d5af44cef
font_01_sfnt_off0000ff0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0F 11464 bytes
SHA-256: 10971001003e09def548a928c782267e9d2f0d83b73329f001d5b568a3c63a31

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