Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d9b4bee404ec35c…

MALICIOUS

PDF

77.5 KB Created: 2021-01-09 17:31:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 59a315aec2e11972bc4a1e9fb9e11bca SHA-1: 32e7e4723537d94402557db456d41e42b3112ba7 SHA-256: 5d9b4bee404ec35c33e79df718e9874ded26327b8f8f9fbf7d3bca74991acfce
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or phishing operation. The presence of a URL with 'cyberghost cracked apk free' in the utm_term parameter indicates a lure for potentially malicious software downloads. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan.

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 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.
  • 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://trafffi.ru/aws?utm_term=cyberghost+cracked+apk+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460450/normal_5fbc0271a1a0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405195/normal_5fb478fa945a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401697/normal_5f94334a7e044.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458125/normal_5fbf3e849e5ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375908/normal_5f89f01d589a8.pdfIn PDF document text
    • https://fidimamafiw.weebly.com/uploads/1/3/4/6/134624465/rakeveziveb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448986/normal_5fdeb8108dc54.pdfIn PDF document text
    • https://zujakeme.weebly.com/uploads/1/3/4/0/134041616/venenubab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374533/normal_5f97603811844.pdfIn PDF document text
    • https://faliroralomi.weebly.com/uploads/1/3/0/8/130874474/toxopibesaganed_ziwub_vafob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421461/normal_5f972e7c3b2dd.pdfIn PDF document text
    • https://samoxaposem.weebly.com/uploads/1/3/4/3/134361226/e9b1715ea8b.pdfIn PDF document text
    • https://nevutero.weebly.com/uploads/1/3/4/7/134716167/1418393.pdfIn PDF document text
    • https://kezexawu.weebly.com/uploads/1/3/0/8/130814062/juwazoz_zeririmubozom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452595/normal_5fa5e089d0c25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388065/normal_5fb2d61c2a326.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e75e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75E 5596 bytes
SHA-256: 679eb5b45838efa039ced221680d2bf2bfd0116e56b4288cdbf8debdacc5a825
font_01_sfnt_off0000fa5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5F 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off000102ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102ED 10968 bytes
SHA-256: 7648aedcd34385f28549384deac3078872ab53ab75e0ce0482af2da436086cbd

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