Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cd79316ac3100f5…

MALICIOUS

PDF

80.7 KB Created: 2021-01-11 12:59:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 698a3d3da5a2de883d1ce4b316c2f3f2 SHA-1: 83c28344d777398633d17d7b3c0a8c4b42f5c5c4 SHA-256: 4cd79316ac3100f5030befab5da337f53b156c56e8618a9fa81db855b2e68b5d
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one prominent URL pointing to 'trafftec.ru', suggesting a phishing or malware distribution lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates a pattern of hosting multiple links on disposable domains, reinforcing the malicious nature of the document.

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://trafftec.ru/aws?utm_term=template+business+contract+between+two+companies PDF link annotation
    • https://site-1168401.mozfiles.com/files/1168401/45954469607.pdfIn PDF document text
    • https://cdn.sqhk.co/jemajujo/ijfhh4J/new_brain_test_tricky_puzzles_mod_apk.pdfIn PDF document text
    • https://site-1204337.mozfiles.com/files/1204337/coffin_dance_piano_game_online.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414173/normal_5fc5f48b313bb.pdfIn PDF document text
    • https://kizinuraximi.weebly.com/uploads/1/3/4/4/134446503/panavi_wabaperenafo.pdfIn PDF document text
    • https://site-1168163.mozfiles.com/files/1168163/noviditoxovudop.pdfIn PDF document text
    • https://nadatipaj.weebly.com/uploads/1/3/5/3/135347779/maxeduzobudawuw.pdfIn PDF document text
    • https://cdn.sqhk.co/lonuxonemor/oWrvhfB/e_wallet_scholastic.pdfIn PDF document text
    • https://site-1176512.mozfiles.com/files/1176512/xopegavamujuvizakase.pdfIn PDF document text
    • https://site-1178598.mozfiles.com/files/1178598/begelo.pdfIn PDF document text
    • https://cdn.sqhk.co/zaperarori/ib57Jwg/stack_fall_guys_ball_physics.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415519/normal_5f9f172c71fb6.pdfIn PDF document text
    • https://cdn.sqhk.co/gabamulijawe/gghhhjh/28636805856.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gotijejaj/final_scratch_2_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/48083480144.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/bling_bling_ikon_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/bivanud/23469640881.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/juzuvirab.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f17b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17B 5144 bytes
SHA-256: 8bffa114ed97f69e30020d11a9ef4bb09f5415f3635533f054b57db29482aa10
font_01_sfnt_off000102df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DF 10488 bytes
SHA-256: 716698bd1bc810da2fd951d05c4a6169a261911a87ee6768029476533a782a22
font_02_sfnt_off000126c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C8 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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