Malicious PDF — malware analysis report

Static analysis result for SHA-256 728af6b0159e6360…

MALICIOUS

PDF

79.9 KB Created: 2021-02-27 10:36:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: aed325f4b5b555c98e537d9f13bf462f SHA-1: eed1fe5ea5bccfe2c7f45b2bb0ea97aa3e3c3c4c SHA-256: 728af6b0159e636020d4d70af61f236b35040c8027fd6b4208d80a3a71c2108e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading a secondary payload via the embedded links. No scripts were extracted, but the overall structure and heuristic firings point to a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://baarspo.ru/strik?utm_term=quran+online+urdu+translation+pdf PDF link annotation
    • https://cdn.sqhk.co/loxexafetivu/jegdyif/49548390788.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369304/normal_5feb276973ff9.pdfIn PDF document text
    • http://alexandreablog.com/game_my_talking_angela_cheat_apko4eja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481667/normal_5fd69e4dde56d.pdfIn PDF document text
    • http://trynutra.shop/21563159425jma14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420592/normal_5fd8ea826ae38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443344/normal_601cb3617293a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500910/normal_5fe565b2697d4.pdfIn PDF document text
    • http://astrology-personal.online/romeo_and_juliet_star_crossed_lovers_quotewls37.pdfIn PDF document text
    • https://cdn.sqhk.co/noxomosanena/71SW3T4/86207519578.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468537/normal_5fc6641b50259.pdfIn PDF document text
    • https://cdn.sqhk.co/bopibege/iaLchcL/12641829840.pdfIn PDF document text
    • https://nabinavupofi.weebly.com/uploads/1/3/5/3/135350319/losatilukobibu.pdfIn PDF document text
    • https://www.eccellasmiles.comIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/likizosidukanexo.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA16 5096 bytes
SHA-256: 3e231351261ec8590d81202f6dddb48133607482040247117f0c7a06b41ce30f
font_01_sfnt_off0000eb74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB74 12684 bytes
SHA-256: 54a5cd11dcc962546d277f331941e76e8a9cae6490fd8e7e7262f597070262be
font_02_sfnt_off00011427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11427 18440 bytes
SHA-256: aa55e262b83811d2b33a0b3491b4d6eb311f374cb7a303ce294296fa176bedb7

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