Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0a4bbd4e7e58bcf…

MALICIOUS

PDF

79.6 KB Created: 2021-02-16 20:46:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 43808c7ff98c3b3a5e35030b873fd155 SHA-1: 4b158ebe18da4d48eca7bda099f517b44ad990d4 SHA-256: c0a4bbd4e7e58bcfa5031eb4207efe364ac5c561bd8c59b058621bf064041df5
126 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a network of links on potentially malicious hosting, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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/wix?keyword=ball+of+whacks+designs PDF link annotation
    • http://goodsun.space/california_politics_a_primer_freesds2u.pdfIn PDF document text
    • http://igafnd.org/les_espaces_productifs_et_leurs_volutions_coursn1dsg.pdfIn PDF document text
    • http://snegny.com/wunderbar_studios_theme_music5wz6h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461525/normal_601ffe54d0791.pdfIn PDF document text
    • http://richteam.site/logebolalodedumiretato7at.pdfIn PDF document text
    • http://fastpysystem.online/12108153103m73na.pdfIn PDF document text
    • http://smotrikino.fun/poweriso_error_code_3229htz.pdfIn PDF document text
    • http://pek-24.cc/818488289237tm6x.pdfIn PDF document text
    • http://misstourist.info/best_word_of_the_day_app_ioszai5d.pdfIn PDF document text
    • http://goodshopsales.xyz/892289040413kro0.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/zopenave/51830495877.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/beruvul.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_off0000f301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF301 5392 bytes
SHA-256: cbd25b4a954241662aec6935d78e8d7ba27b2a59896db88fcdd1137a7700350e
font_01_sfnt_off00010573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10573 14372 bytes
SHA-256: a7cbd5391c4fd72b749311460e30c329ecdcc75edbb5af30f0beb6ebab51eb03

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