Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6e71d7a98c86857…

MALICIOUS

PDF

72.0 KB Created: 2021-06-13 23:17:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a6880ea2734d629fc0018c2c49c5356 SHA-1: 6b7e4b0eb6c63ff369319b8801c4fca3408c83b2 SHA-256: f6e71d7a98c86857ba77fdc21b1c7f85f34b1f88dfc35052873f0fb99adc2188
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, suggesting it functions as a link farm, potentially to distribute further malware or conduct phishing. The presence of urgency language in the document body further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://medvor.ru/pbw?utm_term=katti+mela+katti+mp3+songs
    • https://pogugabumivo.weebly.com/uploads/1/3/1/3/131381840/1f584c28.pdf
    • https://static.s123-cdn-static-d.com/uploads/4367013/normal_60afe96e85028.pdf
    • https://cdn-cms.f-static.net/uploads/4477373/normal_602b88f0384ea.pdf
    • https://cdn-cms.f-static.net/uploads/4412593/normal_6047c8b3e4b2f.pdf
    • https://cdn-cms.f-static.net/uploads/4384831/normal_606e9f633e9a4.pdf
    • https://static.s123-cdn-static.com/uploads/4373782/normal_60098d0182216.pdf
    • https://zunotebizi.weebly.com/uploads/1/3/4/6/134648513/fedd4c07dc2f78c.pdf
    • https://vufagejibuto.weebly.com/uploads/1/3/1/4/131483336/0fbe3b940.pdf
    • https://zanobuxukopul.weebly.com/uploads/1/3/4/6/134678616/4188810.pdf
    • https://static.s123-cdn-static.com/uploads/4465007/normal_60090bb34fc9e.pdf
    • https://kojezuduw.weebly.com/uploads/1/3/5/3/135326104/5520438.pdf
    • https://cdn-cms.f-static.net/uploads/4466689/normal_605f347a99ac1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kemulosomul.pbworks.com/w/file/fetch/144654204/farming_simulator_2017_key_activation_download_free_pc_full_game_cz.pdf
    • https://uploads.strikinglycdn.com/files/6986eb53-c091-4aba-90d0-776982d63794/wejoz.pdf
    • http://kiwazotomija.pbworks.com/w/file/fetch/144647622/31376028656.pdf
    • http://nuxawakaxaz.pbworks.com/f/rudaranitumatuxosejul.pdf
    • https://uploads.strikinglycdn.com/files/20a9d14e-c99b-4203-82e0-43747591d161/44050229828.pdf
    • http://munonoraze.pbworks.com/w/file/fetch/144666216/37563749798.pdf
    • http://rirutatofiv.pbworks.com/f/can_i_play_pubg_mobile_with_keyboard_and_mouse.pdf
    • http://runaliguredu.pbworks.com/f/what_is_the_next_power_rangers_series_after_dino_fury.pdf
    • http://funinupun.pbworks.com/w/file/fetch/144807624/54703534841.pdf
    • https://uploads.strikinglycdn.com/files/f07f4d13-64ca-41c7-bd71-be0f5965babf/how_much_do_david_and_annie_make_on_90_day_fiance.pdf
    • http://petapek.pbworks.com/f/70613755891.pdf
    • http://mavujorar.pbworks.com/w/file/fetch/145212414/students_should_not_wear_school_uniforms_persuasive_essay.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_off0000dc08.bin
07747d599ac345434f664c40c6b85e41f42c38e62bfaa22c086481bebc820fd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC08 5240 bytes
font_01_sfnt_off0000edd1.bin
0592d4b305ef5e78207de723c0c3997e494a015d5eb7284795bb6e75d81f2d2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD1 10736 bytes

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