Malicious PDF — malware analysis report

Static analysis result for SHA-256 34a0f96a5d571bcf…

MALICIOUS

PDF

84.5 KB Created: 2021-05-15 17:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: db71b996a214d5218e1340cc56fbe57b SHA-1: 56bed4f6df473f6cf9ff673e180c1413b54efcb8 SHA-256: 34a0f96a5d571bcf9fa4d9bd7c6a5d049504d99d4858376603b844c812cf86fa
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, many pointing to disposable domains, suggesting a link farm or redirection scheme to host malicious content. The document body, though heavily obfuscated, contains metadata related to its creation by wkhtmltopdf, indicating it was likely generated programmatically to serve its malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jacksth.ru/strik?utm_term=what+was+the+point+of+the+letter+from+birmingham+jail PDF link annotation
    • http://vobajujabu.mywebcommunity.org/ust_criminal_law_2_reviewer.pdfIn PDF document text
    • https://cdn.sqhk.co/fezivabuja/ijVgf3Y/88943371545.pdfIn PDF document text
    • http://strahauto.website/gizexadigufigenujaxeg77wym.pdfIn PDF document text
    • http://naxajogilelog.medianewsonline.com/agriculture_books_in_punjabi.pdfIn PDF document text
    • https://cdn.sqhk.co/tegiriwepaj/cjhihF6/44118478951.pdfIn PDF document text
    • http://xasekijig.mypressonline.com/78010485697.pdfIn PDF document text
    • http://tehnikator.ru/83399610653z9e6k.pdfIn PDF document text
    • https://kaxojolomo.weebly.com/uploads/1/3/4/8/134885197/zegonelolevot.pdfIn PDF document text
    • https://cdn.sqhk.co/zupuguvawaj/eAxicR8/gamozuzokopore.pdfIn PDF document text
    • https://dopubitiru.weebly.com/uploads/1/3/0/7/130776304/806351fa83.pdfIn PDF document text
    • https://wujawosekeg.weebly.com/uploads/1/3/4/7/134712458/kemusogotasivo.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/gchdjaG/lolegafofapolad.pdfIn PDF document text
    • https://wesuzimowigimeb.weebly.com/uploads/1/3/4/7/134745326/105b129b95d220b.pdfIn PDF document text
    • http://ledimpress.biz/20255662448vad5k.pdfIn PDF document text
    • http://avit0.pro/double_gun_shoulder_holster_for_saleb5525.pdfIn PDF document text
    • https://cdn.sqhk.co/tenalewi/klMLfZt/tetafawezawilalitoxube.pdfIn PDF document text
    • http://hardcreditcheck.info/633449154335c5w9.pdfIn PDF document text
    • https://gasimela.weebly.com/uploads/1/3/1/3/131398285/a2e1dced2684.pdfIn PDF document text
    • https://morinuzarisifuf.weebly.com/uploads/1/3/4/2/134234593/sipugupo_joseluwasare_tujeva.pdfIn PDF document text
    • http://kudukudimox.sportsontheweb.net/sobutifigujanirasijowibi.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/jagux/91008919687.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/midas_m32r_manual.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001267e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1267E 18716 bytes
SHA-256: f39e5a6b6dd631a07f18b06e2a4f48584b256aa284be49430bf2c5b1925cf1e5
font_00_sfnt_off0000ef02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF02 5636 bytes
SHA-256: 81922559116d50b809654df79b50c267d1684afb4f98021dbd7cd74c654dc1df
font_01_sfnt_off00010228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10228 10620 bytes
SHA-256: ea25fdaa2a859a6912e83e7c0fa2ed5006ca6f3d5ddf2c4d16a9913f55ba6fd2

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