Malicious PDF — malware analysis report

Static analysis result for SHA-256 d89cf3b63a41f961…

MALICIOUS

PDF

63.5 KB Created: 2021-01-11 04:02:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a1d238d32be0a4bb13cd5ee350739b5 SHA-1: 14c139853761873c9941c8eeab93981d2d8733af SHA-256: d89cf3b63a41f961a128ec7feae41eaff89d2b8d6f3f180d3e2f84e76ef3f0f8
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous links suggests a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ggtraff.ru/123?utm_term=indominus+rex+toy+jurassic+world
    • https://cdn-cms.f-static.net/uploads/4382770/normal_5f93f68a41d52.pdf
    • https://cdn-cms.f-static.net/uploads/4425738/normal_5fbefea987c74.pdf
    • https://cdn-cms.f-static.net/uploads/4380691/normal_5fea10d64daaf.pdf
    • https://site-1178468.mozfiles.com/files/1178468/space_racing_2_hack_apk_free_download.pdf
    • https://cdn-cms.f-static.net/uploads/4449996/normal_5faa86f9d35bb.pdf
    • https://site-1214293.mozfiles.com/files/1214293/79007920895.pdf
    • https://site-1176369.mozfiles.com/files/1176369/worldsbk_tv_schedule.pdf
    • https://cdn-cms.f-static.net/uploads/4413567/normal_5fd2dedc510f1.pdf
    • https://site-1173582.mozfiles.com/files/1173582/58634384386.pdf
    • https://cdn-cms.f-static.net/uploads/4444353/normal_5fc18937cd680.pdf
    • https://wijejotuxaketuv.weebly.com/uploads/1/3/4/3/134338978/temiza-silisosi-monexavova.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kozewuposoridil/auraria_campus_map.pdf
    • https://s3.amazonaws.com/zabejuvijolu/agyaat_part_2_movie.pdf
    • https://s3.amazonaws.com/bupaxomu/78249922552.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bad8.bin
deedc72b9ce5f496d8f0dfecec7cbd8adee571202c11dc4d8081aaa41df7507b
pdf-font-stream PDF embedded font (sfnt) at offset 0xBAD8 5360 bytes
font_01_sfnt_off0000cd14.bin
63928fd74079e5b648894656d107cdecbf300ae45ca29ce54115306725019aae
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD14 10532 bytes