Malicious PDF — malware analysis report

Static analysis result for SHA-256 a94aba26b4773f6b…

MALICIOUS

PDF

74.5 KB Created: 2021-02-22 20:39:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 41fd6a80a34e7d9f20fff1c5bb42dfbe SHA-1: a20c0907a13e062c38a334a1a9912dcd33ee0b44 SHA-256: a94aba26b4773f6b50cfa042050dbe6d90a72f8a669a61fc9b21c5a31f72ec49
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious websites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/wix?keyword=the+causes+of+the+french+revolution+%25281%2529+worksheet+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4456686/normal_600fc72064149.pdfIn PDF document text
    • http://lifeit.pro/20859796562z465z.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461211/normal_5ff3a52e5500e.pdfIn PDF document text
    • http://naturagrush.space/65878346141pjlvr.pdfIn PDF document text
    • https://cdn.sqhk.co/vefoxewijuja/nI3ijhc/pozedisikozisu.pdfIn PDF document text
    • https://cdn.sqhk.co/jifegusewe/H6nifgc/earthlink_internet_availability.pdfIn PDF document text
    • https://cdn.sqhk.co/gulifunanale/G7xwji7/skyrim_face_editor_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/javomekoru/bhvgevz/find_snapchat_friends_by_location.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367273/normal_6012d61fa292b.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetona/hija580/salibam.pdfIn PDF document text
    • http://gladkoe-telo.xyz/la_promenade_de_flaubert_tapuscritrti63.pdfIn PDF document text
    • http://fredo.bike/adobe_acrobat_for_pc_windows_74541p.pdfIn PDF document text
    • http://servicesforsupport.com/jefotapugalifadold5sg.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/temujonuwu/42673554661.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_off0000e61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61A 5340 bytes
SHA-256: 750107446a194db3b01187723ec9d52bfd33c97c5c6d207c3d76aaa4a61e31ff
font_01_sfnt_off0000f86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86B 10652 bytes
SHA-256: c20a85b8fa8feb40cca079718beb0805a484749a710821dcf6bcc37b50410741

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