Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b0abf140fc08973…

MALICIOUS

PDF

85.6 KB Created: 2021-03-20 19:05:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c071cb159c33f8c69619f9d4f7d2d61e SHA-1: 2490767c5ac07fc6760ed08bd98163c7271bc8fb SHA-256: 0b0abf140fc089732bf96be894a1128729f5631c5f008d32e749c6267477ba4b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many hosted on disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely to distribute malware or phish for credentials. The presence of external URIs suggests the document's primary purpose is to redirect the user to malicious sites.

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 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://botokaw.ru/123?utm_term=antivirus+android+galaxy+s8
    • http://4kuhd.me/rooster_in_my_rari_meaning9xqvn.pdf
    • https://dilemawusufugo.weebly.com/uploads/1/3/0/8/130874642/4491734.pdf
    • http://leoidet.xyz/werejabupatepewavadaf305sc.pdf
    • https://cdn.sqhk.co/wekaradukuve/XhfgdZ9/55031620694.pdf
    • https://neseroto.weebly.com/uploads/1/3/5/3/135326238/dd56fec993eb.pdf
    • https://cdn.sqhk.co/vinasujitupe/zfgHDje/peacemaker_gun_range_west_virginia.pdf
    • https://static.s123-cdn-static.com/uploads/4380090/normal_5ffca6b130a27.pdf
    • https://tezifotunojoke.weebly.com/uploads/1/3/0/7/130776805/lobuveka.pdf
    • https://cdn-cms.f-static.net/uploads/4419425/normal_6055f34f65fb8.pdf
    • https://zovijopafirol.weebly.com/uploads/1/3/4/6/134630452/zugetabes.pdf
    • https://liduwofixuxobef.weebly.com/uploads/1/3/0/7/130739348/doniwabemomudoja.pdf
    • http://jitaguzo.22web.org/35568685160.pdf
    • http://pokawibu.iblogger.org/huckleberry_finn_banned_book_reasons.pdf
    • http://kutivuxugufif.iblogger.org/wezedujemesab.pdf
    • https://cdn.sqhk.co/nupozifulija/ly4v1bw/binkw32_dll_assassin_creed_brotherhood.pdf
    • http://hotita.space/guvipovoxizax57g4i.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sawutex.rf.gd/27841910735.pdf
    • http://vumupekosevi.rf.gd/siguzavu.pdf
    • http://sixuregorajaso.rf.gd/advanced_accounting_joint_venture.pdf
    • http://kogemevegij.epizy.com/resume_format_for_teacher_job.pdf
    • http://salekisaju.epizy.com/50018197312.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_off000110b6.bin
14ceb04d198185cc0321620a679fe842aab78603731aeb91b19ba7deb1cb334a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110B6 5408 bytes
font_01_sfnt_off00012332.bin
1f716ee3674df924e27d93ee451117e73fa621cc89cb2a9109782f8a8e6347a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12332 11088 bytes

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