Malicious PDF — malware analysis report

Static analysis result for SHA-256 1be5e16ecd1cf8a4…

MALICIOUS

PDF

67.3 KB Created: 2021-01-08 06:58:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c50417e686aa9a515e7364bd34bfabe SHA-1: 6e55a43a92a2206a5243e9d8a6d3c3a2be469b1e SHA-256: 1be5e16ecd1cf8a465f280a52df175d31051857902ba724c521f5b77b455b6fe
96 Risk Score

Malware Insights

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

The file was identified as malicious by a machine learning classifier and ClamAV, specifically flagged as Pdf.Phishing.Trojan. The embedded URL, 'https://trafffi.ru/123?utm_term=nova+lab+answer+key', is likely a phishing lure. Although no scripts were explicitly extracted, the PDF structure and the presence of an external URI suggest an attempt to redirect the user to a malicious site, aligning with spearphishing tactics.

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/123?utm_term=nova+lab+answer+key
    • https://cdn.sqhk.co/vuxeneson/chiHNgP/stickman_rope_hero_game_free_download.pdf
    • https://cdn.sqhk.co/guletema/9hdA6ia/jijiwimewo.pdf
    • https://cdn.sqhk.co/vovewotutal/2hcjejc/hangout_word_meaning_in_bengali.pdf
    • https://cdn.sqhk.co/murajefovel/dIieRjg/btc_recharge_mobile.pdf
    • https://cdn.sqhk.co/kanereneb/hejC6hg/stretch_diy_slime_simulator_2019_release_date.pdf
    • https://cdn.sqhk.co/dozumapufa/bxzahjN/london_stock_exchange_free_courses.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wifozuxeku/32290511781.pdf
    • https://uploads.strikinglycdn.com/files/5bfab8bc-5f39-4896-a6f4-bd0e275e47d5/super_mario_advance_romsmania.pdf
    • https://uploads.strikinglycdn.com/files/7f91a8af-96d9-442a-beb0-6842ea74bc8d/zedd_house_david_dobrik.pdf
    • https://s3.amazonaws.com/mokuwanibof/gomaro.pdf
    • https://uploads.strikinglycdn.com/files/3e148b05-d49f-4b9a-8f8b-a8d81cbca071/dd_srd_brown_bear.pdf
    • https://uploads.strikinglycdn.com/files/ebb50430-c9f2-4f03-8cdd-1c1a0e6a8dfd/82758908592.pdf
    • https://uploads.strikinglycdn.com/files/d9bb7cee-09bc-48b9-9cf9-96a772423c70/gegodesotasejisaxikuja.pdf
    • https://uploads.strikinglycdn.com/files/3d6634d5-ba6e-4930-b7e4-56425e0c979e/ncaa_football_championship_trophy_replica.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_off0000c0df.bin
b7dfed2b6263c8437b0c2beb59fd86e1ce92c2fd422c71948afaced02129f81c
pdf-font-stream PDF embedded font (sfnt) at offset 0xC0DF 3360 bytes
font_01_sfnt_off0000cccd.bin
9b5b9d3143804e573d7c585a7a32c84eed64bd2df3d2de74b0570a429f26c149
pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCD 5104 bytes
font_02_sfnt_off0000de54.bin
f030e96c7ab73b6ba81d0b0bf975933043ca65138ebf6e4ccd6840c8174024dc
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE54 10004 bytes