Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a3cb4a89c727920…

MALICIOUS

PDF

81.5 KB Created: 2021-03-16 21:16:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: a82afd0bbcbe7a9c23c62969c4c039ce SHA-1: 0e8ad3d394ee4802ea1333818feae6d6a48cc736 SHA-256: 3a3cb4a89c727920979bde0905d17406530eb0a99587a4195064874f89cd71d7
126 Risk Score

Malware Insights

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

The PDF document contains obfuscated text and multiple embedded URLs, with one prominent URL pointing to a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous URLs suggest a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jumiwimov.ru/strik?utm_term=dell+inspiron+6400+usb+driver+download PDF link annotation
    • https://cdn.sqhk.co/sonometa/XjhifAi/hockey_statistics_jobs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445555/normal_6044feb5a5493.pdfIn PDF document text
    • https://cdn.sqhk.co/xubupigegi/j4hc4jj/larobox.pdfIn PDF document text
    • http://videohost.space/50058011497v6roj.pdfIn PDF document text
    • https://cdn.sqhk.co/fovulifavu/xiehjjc/all_call_recorder_app.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412159/normal_5fe1124e4e0a3.pdfIn PDF document text
    • https://cdn.sqhk.co/zawukomofise/BHUxgfL/gajozapunozitepiw.pdfIn PDF document text
    • http://lidzadva.xyz/taxoxxe12a.pdfIn PDF document text
    • http://supsun-aero.com/fallout_4_ps4_graphics_mods_2020ynqs0.pdfIn PDF document text
    • https://cdn.sqhk.co/vufebevefo/iakubib/square_painting_on_wall.pdfIn PDF document text
    • https://cdn.sqhk.co/belesobikezi/YFguU6E/line_puzzle_pipe_art_online.pdfIn PDF document text
    • https://cdn.sqhk.co/dibirolinu/q7nRkje/diloz.pdfIn PDF document text
    • https://cdn.sqhk.co/tedubifo/jgHHjbS/zorusi.pdfIn PDF document text
    • https://cdn.sqhk.co/luwokiseg/juksXR3/underfell_papyrus_x_wolf_pup_reader.pdfIn PDF document text
    • http://hook-up.fun/sheldon_axler_linear_algebra_done_rightjs6s1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467318/normal_5fffb51d0320b.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/bugutaj/bhagavathi_movie_free_mp4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c30ee174-af90-4ad8-a2e0-508447e4512d/what_is_smart_wristband.pdfIn PDF document text
    • https://s3.amazonaws.com/sojuravewi/60411221854.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41a2aba0-cddd-44d5-bef0-eae3574d69a0/12982106608.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecb1c0b0-c7ca-43ec-98c0-5906ef8dcbfe/56612829459.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53de500e-3402-47d8-91c7-a07d0483d562/the_end_of_the_affair_movie_online_free_stream.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/299b5dee-e4e0-4c05-aa83-73618b047f88/metaphysical_bookstore_los_angeles.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_off0000f4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A5 5432 bytes
SHA-256: 6ed0efa3958ebfaaf198a7dfee503a64a57fc430ba0caae0bafe8c4e5d7a1fc8
font_01_sfnt_off0001072f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072F 10308 bytes
SHA-256: a1459a257b79210bc4660abfdf591d8e34ac1e6ffd43ed001ef2f548d5535a31
font_02_sfnt_off00012a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7B 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e