Malicious PDF — malware analysis report

Static analysis result for SHA-256 a44d5eb55de59bbe…

MALICIOUS

PDF

84.8 KB Created: 2021-03-19 07:30:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ebe3f117c124b7d1cc0e0fadaf30632f SHA-1: 368a94f6d644d262ec757638160a7d7120249005 SHA-256: a44d5eb55de59bbe8eb7347f49d1573bcfe86d819955830b347149cb1934258c
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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/wix?keyword=titration+pre+lab+questions+answers PDF link annotation
    • https://cdn.sqhk.co/raxulaxesob/gdhdpDG/software_update_ipad_2_ios_10.pdfIn PDF document text
    • http://domainlimax.xyz/graduation_reception_templatesgi22l.pdfIn PDF document text
    • https://cdn.sqhk.co/zarejesorufo/MhjShaV/planet_fitness_stockton_blvd_sacramento.pdfIn PDF document text
    • http://bomudomi.iblogger.org/brain_teaser_questions_with_answers.pdfIn PDF document text
    • http://storeyou.store/how_to_reset_asus_router_account_password21c2k.pdfIn PDF document text
    • http://decideyouself.fun/english_padhne_ka_tarika_video6j4ud.pdfIn PDF document text
    • http://gratoraama.website/rugby_league_2019_mod_apk2g24t.pdfIn PDF document text
    • https://cdn.sqhk.co/suxepemup/DEYmigo/84129933831.pdfIn PDF document text
    • http://instapriz.site/14411016980c8xrb.pdfIn PDF document text
    • http://bandalet.club/40426165496gfkjw.pdfIn PDF document text
    • http://itdomen.fun/can_you_day_trade_stocks_in_a_roth_irakthzq.pdfIn PDF document text
    • http://technodom11.com/86832584285q1fl4.pdfIn PDF document text
    • https://cdn.sqhk.co/xaranoraf/gjoihgy/demoju.pdfIn PDF document text
    • http://pro-konditer.com/eddie_bauer_stroller_compatible_car_seats3jl9.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
    • http://lunujebof.rf.gd/does_dunkin_donuts_flavor_shots_have_sugar.pdfIn PDF document text
    • https://3568ea06-17fa-4787-91ae-86b9aa918cbd.filesusr.com/ugd/8ade13_bae9ddd26701469d8e4c25bfc64b0e07.pdf?index=trueIn PDF document text
    • https://5d3a3edc-1384-4eb0-a354-174dd54c13aa.filesusr.com/ugd/7f5dc5_6610c4b112b549858f06bfd6d4b2e263.pdf?index=trueIn PDF document text
    • https://97e6e6c8-040d-427c-ad66-6ef02350ae38.filesusr.com/ugd/9c523c_03c9eb2930174518a74562484103c914.pdf?index=trueIn PDF document text
    • https://c4a0f302-b060-43a0-af10-a0364da5eca7.filesusr.com/ugd/c6d327_ae8b981da1554495a2d591f6a578d1f1.pdf?index=trueIn PDF document text
    • https://c3438639-6a75-4920-aa4f-d1e0b619354f.filesusr.com/ugd/3be3a7_cc7654463023423daba803ba3aa4c4f2.pdf?index=trueIn PDF document text
    • https://e3e1c2aa-7f41-47b0-8c2f-d823cb48b857.filesusr.com/ugd/7598fa_334d2915ec3047deb06e1d86c91ab01d.pdf?index=trueIn PDF document text
    • http://refewededuxita.epizy.com/4297931111.pdfIn PDF document text
    • https://d3826037-6016-486c-99e9-dc41bc666644.filesusr.com/ugd/b81754_0e725c48ac4847e784aeeb01e5f4a18a.pdf?index=trueIn 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_off0000ff33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF33 5000 bytes
SHA-256: 5dcd8e18fd688b85d8be0bdcc645eaae1ad06fe8cbeffde7bc568b872dc37138
font_01_sfnt_off00011044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11044 11016 bytes
SHA-256: 9618de5b286baf5bba94d4adc1a8ee41a041fd8bd1928906982c7b2aeedf2165
font_02_sfnt_off000135aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135AA 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230