Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a8caf265fc53e14…

MALICIOUS

PDF

81.5 KB Created: 2020-12-20 18:02:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 1fc75078a739b7d88ec7885678b74090 SHA-1: 917c1a025400d372d19a972e85cdcf83506df3de SHA-256: 3a8caf265fc53e14238cbe76930924ff6f2cf54253d8e811c8680b678fb721ea
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a malicious site. The document body is heavily obfuscated, suggesting an attempt to hide its true purpose, which is likely to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=ffxi+ninjutsu+skill+up+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4391008/normal_5fa4d22084dbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376120/normal_5fdc625870a4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402478/normal_5f90dca8a4de3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417809/normal_5fb873999169a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383149/normal_5fb366a84eae6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410954/normal_5f9e5847923d2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0057cd9-131b-4f47-b30b-abefd27bbe43/senovopusemev.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc707e8f59f035d0ccacbcf/t/5fcc9a645177ea328cbcf5d6/1607244388867/werewolf_song_evolution.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb63bab8-9432-4f3b-845e-3e8da01e811a/rugulafarofokefa.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2fb60c30a162e0c601609/t/5fc5e9966457125654084e87/1606805910539/75947870388.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1771924b06a7eb3033110/t/5fccf99c662d5e24e0a44836/1607268764883/skins_for_roblox_project_x.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc78cb91969b523a421460e/t/5fd1f071eeaf2774ac90aa76/1607594098698/kizegadadi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fc23288-a1e8-40a5-8c2f-82f2d1041231/storytelling_manual_project_4.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc3676dc6d96458363207a7/t/5fcb1368190ee82df8d6f6f7/1607144297231/fitbit_versa_2_review_cnet.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_off00011a34.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11A34 19116 bytes
SHA-256: 8659ce74f226d29d6b64a533de47824440d27323895d64a522b81d9b68ef5652
font_00_sfnt_off0000e2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A6 5064 bytes
SHA-256: 20f929355d899143d3a35e303d97cb07203746281e3c79ce6cc8d8e78e3e3b0a
font_01_sfnt_off0000f410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF410 11156 bytes
SHA-256: 73a97317b0218ff08021d27650ca4c13c9b579a05e8998db18f1cf6fe13d2f3b

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