Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc646561d881d8e0…

MALICIOUS

PDF

82.4 KB Created: 2020-11-13 05:57:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d0aa09eef32682acdc7130e044e929a SHA-1: d4c026c60abf1edab4c5f4bf0079723c25ed9998 SHA-256: dc646561d881d8e0c8990cc222ba114d4251d2a191e42d4da7eaf1ea3af2f9c0
104 Risk Score

Malware Insights

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

The PDF file was detected as malicious by a ClamAV signature and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'traffset.ru', which is likely used to deliver a secondary payload or redirect the user to a phishing site. The document body, though heavily obfuscated, suggests a lure related to an 'answer key', aligning with common social engineering tactics.

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffset.ru/aws?utm_term=drdo+ceptam+9+answer+key+date
    • https://cdn-cms.f-static.net/uploads/4379718/normal_5f8ae69e39c3e.pdf
    • https://cdn-cms.f-static.net/uploads/4476756/normal_5fa97393b6c09.pdf
    • https://cdn-cms.f-static.net/uploads/4390999/normal_5fa29bfa13cb5.pdf
    • https://cdn-cms.f-static.net/uploads/4427828/normal_5fa0134732a0d.pdf
    • https://cdn-cms.f-static.net/uploads/4383702/normal_5fa3cdc72a38d.pdf
    • https://cdn-cms.f-static.net/uploads/4420587/normal_5fa3b0a198d3a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://uploads.strikinglycdn.com/files/ba2ea1c0-e7c8-455a-896c-64c67026d6ea/74832684699.pdf
    • https://uploads.strikinglycdn.com/files/5134fc56-9b54-4072-949a-2a96d4eb8cee/nuwobuvilimak.pdf
    • https://uploads.strikinglycdn.com/files/cd18d7de-c28b-4dfc-adff-51c31d985308/death_wish_meaning_in_malayalam.pdf
    • https://s3.amazonaws.com/muxegeza/kejerumutogesovuwa.pdf
    • https://uploads.strikinglycdn.com/files/d22f931a-9006-4a8f-a675-5b73336622d4/pirate_proxy_list_2020.pdf
    • https://uploads.strikinglycdn.com/files/1ebf1010-feeb-404d-a897-c2a6173cd01b/27452883425.pdf
    • https://uploads.strikinglycdn.com/files/17aabf8f-a6c4-491c-8001-31885acd5330/ffxiv_alphascape_3.0_guide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2cd.bin
d28a5900a24b0e72709fd064a64650287caf7dddd8c496b5f0ac578a41cd0a6d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CD 5600 bytes
font_01_sfnt_off0000f5e2.bin
51f851550bfb08d6b07f9e3a51227aaf3323f5f4b248291f84f9bb4f98e776df
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E2 11360 bytes
font_02_sfnt_off00011c9f.bin
70b4cf9cd96a9a4ad18815d584d7967a94f39ed3882af6485ad5b26e000fcaa7
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9F 10072 bytes