Malicious PDF — malware analysis report

Static analysis result for SHA-256 b31747c55405f4df…

MALICIOUS

PDF

81.2 KB Created: 2020-12-19 11:26:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 81eb86087027e017828a815a60269c7d SHA-1: 8d8919f4e0cb57daa0ca167d66a0b5f946ccc6bd SHA-256: b31747c55405f4dfe63c8c6eea765a97ff49e74eb5566cb4e8af38061b363690
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or redirection mechanism for malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution attempt, likely leveraging embedded URLs to redirect users to compromised or malicious sites.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/strik?utm_term=jensen+alarm+clock+manual PDF link annotation
    • https://vetidemilutuzu.weebly.com/uploads/1/3/4/4/134492936/xejakuxonaruvelov.pdfIn PDF document text
    • https://wutiboduselojo.weebly.com/uploads/1/3/4/6/134665342/nesizilaxolokuwumani.pdfIn PDF document text
    • https://luzolujimus.weebly.com/uploads/1/3/4/5/134505858/febitoxigis-bikezal-fumemijerotiraz.pdfIn PDF document text
    • https://galezarulunozip.weebly.com/uploads/1/3/4/8/134896955/7100068.pdfIn PDF document text
    • https://xavujome.weebly.com/uploads/1/3/0/7/130739328/8573814.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc4f6bd5e8e827d42a7e1ed/t/5fc647023485235c869c87fe/1606829827074/bubble_shooter_crack_pc_game_download.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/pifafelut.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdc81a80526ad1a5999a26b/t/5fdd1bc27013094f4c5fbef5/1608326083378/committee_meeting_agenda_template_australia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef81c449-0d5a-4508-a6d5-042e00cc3ad1/who_does_feyre_end_up_with.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5db7e2e34347c70666939/t/5fcf1a0d55629615614b0fb1/1607408142865/cute_girl_cartoon_wallpaper_hd.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce16bbcc0d2519aa9f2e5f/t/5fd1b28623f2866aa3878147/1607578247275/foosball_table_3d_max.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdd52f8c2d4633280e99069/t/5fdd7aeef3f88b619ff6ca8f/1608350447395/argos_twin_cordless_phones_with_answer_machine.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/silicon_valley_season_5_episode_4.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc674b111f6a41984abc95a/t/5fcb082a1880ce05e843b73b/1607141419295/gaxotatulegikipulufetij.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc3660e8787e879897bde4b/t/5fc50242145a8629dc4e5519/1606746690504/84408735819.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e6e25be-b99f-4c7b-a5b9-14a006a768a4/love_is_open_door.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_off0000c89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC89F 18248 bytes
SHA-256: d1aef4fc7b3f20ab88ebd865677329d999b7452881351149215d40f19a35edd4
font_01_sfnt_off0001031a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031A 4996 bytes
SHA-256: 8e4e7d7d93b9faf4163291e7e47c4b3cb9351a52a7bf9ca153cb48aa4f0118b1
font_02_sfnt_off00011402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11402 10452 bytes
SHA-256: d76fa767968ddc2bd5fbadd224e760f832c68ac3a52681f0ac6c27eb6b26c61d

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