Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b144f71a9aabf84…

MALICIOUS

PDF

84.6 KB Created: 2021-04-24 18:45:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a68cfa3d00a5907ac841df2dc781b3e5 SHA-1: e1dca44c7fe94b5d46db8d2d3b5fae0c9bdf28fd SHA-256: 9b144f71a9aabf84d335f0eff4a164ba65630c30c3d317a4e5e6ac3111282f8c
96 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of an external URI pointing to 'dafemum.ru' suggests the document is designed to redirect users to a potentially harmful site. Although no scripts were explicitly extracted, the PDF format can embed JavaScript, which is often used to facilitate malicious redirects or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/strik?utm_term=a+connecticut+yankee+in+king+arthur%2527s+court+slavery+quotes
    • https://static.s123-cdn-static.com/uploads/4476011/normal_6004cab650749.pdf
    • https://static.s123-cdn-static.com/uploads/4414169/normal_5ff71821b97e4.pdf
    • https://cdn-cms.f-static.net/uploads/4481509/normal_5fe86ca4b5023.pdf
    • https://cdn-cms.f-static.net/uploads/4488336/normal_605a4451cec25.pdf
    • http://biolinkus.me/personal_trainer_study_guide5hzne.pdf
    • http://neojust.ru/kyocera_model_e6560ww1xl.pdf
    • http://zhk-samolet-krasnodar.info/wally_receiver_vs_hopper158rz.pdf
    • https://cdn.sqhk.co/kapimetavis/bpLjjjf/the_maze_runner_book_series_pages.pdf
    • http://testertumentum.space/48731370861co284.pdf
    • https://cdn.sqhk.co/xonizarisu/f6vGiib/mobebi.pdf
    • http://italysummer.fun/205908545671ucb.pdf
    • https://cdn.sqhk.co/bukoxomule/ihX82jb/juworufosalutokam.pdf
    • http://milanbeachs.space/ribexuqmwrr.pdf
    • https://cdn-cms.f-static.net/uploads/4452861/normal_6018ae3f40922.pdf
    • http://klyshsheff.xyz/lincoln_weld_pak_175_hd_reviewqkj4g.pdf
    • https://cdn.sqhk.co/konanetufuda/ejjjhqb/wetofigakulirej.pdf
    • https://cdn-cms.f-static.net/uploads/4370053/normal_5fdaef31db5da.pdf
    • https://cdn-cms.f-static.net/uploads/4421778/normal_60183e12ed2ca.pdf
    • https://cdn-cms.f-static.net/uploads/4494677/normal_605470543b22b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/verirejon/fallout_4_steam_api64._dll.pdf
    • https://s3.amazonaws.com/ropuba/conference_of_the_birds_the_story_of_peter_brook_in_africa.pdf
    • https://s3.amazonaws.com/jarawaxanivu/duzamofukowusarok.pdf
    • https://s3.amazonaws.com/widiku/66450636082.pdf
    • https://s3.amazonaws.com/taguxif/64714042729.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_off00010d20.bin
f90455501dfc9c5f0c225aaf77ba937042f0202841c16e165b57ba2798a7d906
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D20 5436 bytes
font_01_sfnt_off00011fb5.bin
48eecdb6a5f34367616c70eb072db81c58d7998c90603b85295f629611c44a3b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB5 10616 bytes