Malicious PDF — malware analysis report

Static analysis result for SHA-256 b11fcc9e4fc17d09…

MALICIOUS

PDF

84.7 KB Created: 2021-02-23 22:47:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d7ede643e7b0fcaa21e8d978fd580e38 SHA-1: 9d82290160afc84e33f66d76466e9397b73ca36d SHA-256: b11fcc9e4fc17d09c5405a8a71373792fe07985c1f1b9ddf708c8f8ccff0de64
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains or subdomains, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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/strik?utm_term=engineering+mechanics+dynamics+book PDF link annotation
    • https://cdn.sqhk.co/wogefosa/NIUjgyA/jurassic_park_builder_games_online_free_play.pdfIn PDF document text
    • https://ratipixudaxixix.weebly.com/uploads/1/3/4/4/134472160/vajuwatafikatagokig.pdfIn PDF document text
    • http://form-lnstagramverifiedbadges.com/amazon_go_grocery_store_technology9qakj.pdfIn PDF document text
    • https://zoveponezewuda.weebly.com/uploads/1/3/0/7/130738822/6614395.pdfIn PDF document text
    • http://weraka.online/80473133801nmydx.pdfIn PDF document text
    • https://veguxalefimas.weebly.com/uploads/1/3/1/3/131382166/47abf6b6cd1520.pdfIn PDF document text
    • https://cdn.sqhk.co/vejuwozigef/Ihjjeib/shipping_and_receiving_supervisor_resume_samples.pdfIn PDF document text
    • https://wibabuxef.weebly.com/uploads/1/3/1/3/131380054/31eb16187aa73.pdfIn PDF document text
    • https://cdn.sqhk.co/vavewiminiv/mjiJygc/33125976719.pdfIn PDF document text
    • http://myyshooop227.site/disney_movies_family_treekx0tt.pdfIn PDF document text
    • https://pabimoju.weebly.com/uploads/1/3/3/9/133997489/taxawotifazesize.pdfIn PDF document text
    • https://cdn.sqhk.co/sopiloroda/Gdhbifg/71718884399.pdfIn PDF document text
    • http://mkuu.club/wojetyvqn7.pdfIn PDF document text
    • https://kuxijixa.weebly.com/uploads/1/3/4/8/134856984/b78f26f6b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jefobexapulow/adjectival_form_of_courage.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/95079922521.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/78190356226.pdfIn PDF document text
    • https://s3.amazonaws.com/votawawo/sumimesuvasinesoz.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE654 5188 bytes
SHA-256: 3ca3e250cb7af3b1b2c139bfe446497e5393e47021b05a256356521ba324abd2
font_01_sfnt_off0000f8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A1 5292 bytes
SHA-256: b25a3c41e6d3c07dae7fe1bd9ef0a7ce2bc8f262875cff503f65840e00a85735
font_02_sfnt_off00010a64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A64 13392 bytes
SHA-256: ceca2ea70fd1ff7fa7f0e00e5cde4d3c126ffae97ef0a722de7ec45db0a22878
font_03_sfnt_off0001358c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1358C 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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