Malicious PDF — malware analysis report

Static analysis result for SHA-256 370f870082018ed7…

MALICIOUS

PDF

82.4 KB Created: 2021-04-25 12:10:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33d1a2663e1ce15b8fa4d22e96451ad2 SHA-1: 682626784ac47b02358adc0651460b28ddcc6687 SHA-256: 370f870082018ed7eaf64584bb89613e5f67b9dd3fd0a70605253f1f124d3396
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier strongly indicates maliciousness. The presence of external URIs and the link farm heuristic suggest the document's primary purpose is to redirect users to potentially malicious sites for further exploitation or content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 4

  • 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://pelibifir.ru/strik?utm_term=anatomy+of+exercise+book+pdf
    • http://datingsexchat.site/overdrive_premium_mod_apk_latest_versionalt9x.pdf
    • http://kozoperog.iblogger.org/13863593945.pdf
    • https://vebuwume.weebly.com/uploads/1/3/5/3/135349689/d8bea1cae0.pdf
    • http://lozhobelir.space/polyatomic_ions_practice39kao.pdf
    • https://sanuvexugivi.weebly.com/uploads/1/3/1/6/131606490/331c989.pdf
    • https://vigenuwotefi.weebly.com/uploads/1/3/4/0/134012497/810124.pdf
    • https://cdn.sqhk.co/letarezetap/CsaOhdD/77800013952.pdf
    • https://cdn.sqhk.co/sirigibi/C2hhePu/vaxekupu.pdf
    • http://springital.fun/boxivusogevomadawejokexuz8aip.pdf
    • http://kompledom.com/46262742156p56qt.pdf
    • https://cdn.sqhk.co/zokosofu/wPkjjVZ/crazy_taxi_3_high_roller_online.pdf
    • https://cdn.sqhk.co/fegujajox/eXKShiB/cartoon_cat_call_gif.pdf
    • https://cdn.sqhk.co/susojitigi/gjM3s3N/equipment_maintenance_service_agreement_template.pdf
    • https://gosasaweju.weebly.com/uploads/1/3/1/3/131384289/rukuduxoj.pdf
    • http://floradoma.net/great_gatsby_vocabulary_chapter_2yt73q.pdf
    • https://gizutiki.weebly.com/uploads/1/3/4/4/134478998/kixamebuv-dikabegopeda-furapaj.pdf
    • http://brosbass.com/vidmate_ka_optionx2cke.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://xilijimerufosat.rf.gd/77626096348.pdf
    • https://s3.amazonaws.com/gonima/how_to_program_suddenlink_remote_control_for_tv.pdf
    • http://palomidifigur.epizy.com/absorbent_mind_maria_montessori.pdf
    • https://s3.amazonaws.com/nonabafat/nozipaxojasumegiguxixa.pdf
    • https://s3.amazonaws.com/xomepixo/copy_sheet_excel_macbook.pdf
    • https://s3.amazonaws.com/zulezov/43205219469.pdf
    • http://jubenopapu.epizy.com/61171508409.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6f4.bin
4b0768d5d2cf48599fefb01396890ba8ee699d6563509ca386d2af702e1d911e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F4 5420 bytes
font_01_sfnt_off0001094f.bin
8dab1ba3d6290acc90fef39895b13afa01269f7a22dce328f8b8e97e3e408a05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1094F 10568 bytes
font_02_sfnt_off00012d7f.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7F 4324 bytes

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