Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3d23152bd53deaa…

MALICIOUS

PDF

74.4 KB Created: 2021-05-20 06:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 1e34d917cda2dd06093d92c6b2cc5f56 SHA-1: 76fad5e6c9e691203609cbf52a8a9403e98e8d8b SHA-256: b3d23152bd53deaafa8d8191c58273fc74bb788126683f700af00926865d5fdb
194 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a link farm designed to redirect users. The document body, though heavily obfuscated, contains references to 'Samsung m2070 driver windows 10' and 'wkhtmltopdf', suggesting a lure for users seeking specific software. The numerous external links, many hosted on disposable domains, indicate an attempt to obscure the ultimate malicious destination, likely a phishing or malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nipisod.ru/strik?utm_term=samsung+m2070+driver+windows+10 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4392441/normal_5ffcacc31fa8d.pdfIn PDF document text
    • https://fewojejano.weebly.com/uploads/1/3/4/3/134348079/310235.pdfIn PDF document text
    • https://zuduwejigorim.weebly.com/uploads/1/3/5/3/135329148/2649671.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446400/normal_5febd4ee7de67.pdfIn PDF document text
    • https://sejumajofejopib.weebly.com/uploads/1/3/2/7/132740214/dbc39075c39850.pdfIn PDF document text
    • https://tazesarazuf.weebly.com/uploads/1/3/4/7/134726557/wusodireduvir.pdfIn PDF document text
    • https://dixipanofonumef.weebly.com/uploads/1/3/5/3/135383266/2127645.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487935/normal_6008d17daa058.pdfIn PDF document text
    • https://wuganinaviset.weebly.com/uploads/1/3/1/8/131871642/fonizuwadogibeb.pdfIn PDF document text
    • https://mixusabap.weebly.com/uploads/1/3/4/0/134096097/80017adcc9144.pdfIn PDF document text
    • https://sidutoxa.weebly.com/uploads/1/3/4/8/134886075/d6c8796a1679e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415304/normal_603c7c1e0f42b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474475/normal_5fd6ed1baa161.pdfIn PDF document text
    • https://sarenudubafuje.weebly.com/uploads/1/3/4/6/134680246/terelux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489724/normal_5fd6dcd1a09fb.pdfIn PDF document text
    • https://pabebubi.weebly.com/uploads/1/3/2/6/132695301/gumep.pdfIn PDF document text
    • https://lafezarawowaw.weebly.com/uploads/1/3/0/8/130874252/1258445.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405437/normal_5ff4582aec1bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453334/normal_5fd60e3c3f5b9.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/mokixetat/delta_loop_antenna_40m.pdfIn PDF document text
    • https://s3.amazonaws.com/ximupuv/purble_place_game_windows_8.pdfIn PDF document text
    • https://s3.amazonaws.com/satedafadusizo/alpha_werewolf_dnd_5e.pdfIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/72136278926.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_off0000e231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE231 5776 bytes
SHA-256: 62f868ec24c196a3fe0efd789afa7d3aa9238dac7ea9c51efdc040847382336e
font_01_sfnt_off0000f5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DB 12072 bytes
SHA-256: 9552c4b8ca7fea6a139d1570a4859ecc6d9572dafe7836f0eaa677aef38c832a