Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd3ade6243810709…

MALICIOUS

PDF

81.7 KB Created: 2021-05-20 04:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2bf3b5f4112e0ee6dd878d9be89526a0 SHA-1: f0086f6d430fcb2db44504febf4849a9458ea6e5 SHA-256: bd3ade62438107092ba6669090f637a7bf73773ab6fd82e355d35f7812697d77
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The primary URL, 'https://midufefew.ru/strik?utm_term=download+no+root+firewall+pro+apk', is presented as a download for a firewall application, indicating a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://midufefew.ru/strik?utm_term=download+no+root+firewall+pro+apk PDF link annotation
    • https://megogolu.weebly.com/uploads/1/3/4/3/134314378/6448571.pdfIn PDF document text
    • https://dodapoxole.weebly.com/uploads/1/3/1/3/131398067/1614448.pdfIn PDF document text
    • https://rogapunuki.weebly.com/uploads/1/3/4/3/134375427/wakedenude.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387419/normal_6004af28e5482.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502336/normal_5fd28229659a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408601/normal_600fcb704faab.pdfIn PDF document text
    • https://xalitizamer.weebly.com/uploads/1/3/4/8/134863297/tifunoporem.pdfIn PDF document text
    • https://nesotufofiwin.weebly.com/uploads/1/3/1/3/131381712/tobisixomedufak.pdfIn PDF document text
    • https://goponubinolofuv.weebly.com/uploads/1/3/4/6/134695307/9306107.pdfIn PDF document text
    • https://xoregofejaba.weebly.com/uploads/1/3/4/6/134651656/2b20c21438c1d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501989/normal_5ff502dff13e9.pdfIn PDF document text
    • https://polopomix.weebly.com/uploads/1/3/4/8/134849819/999263.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369160/normal_5fe49b3a9a3e1.pdfIn PDF document text
    • https://ligotilup.weebly.com/uploads/1/3/4/3/134313371/bofinusenozomerik.pdfIn PDF document text
    • https://xoxumowuna.weebly.com/uploads/1/3/5/9/135964844/digotimivugake_bujutuzibade_viwena.pdfIn PDF document text
    • https://jedopebo.weebly.com/uploads/1/3/4/8/134889916/4642836.pdfIn PDF document text
    • https://fexemefamerera.weebly.com/uploads/1/3/4/2/134236105/balofagodexirajexok.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/92d5594c-c75a-4861-b6ce-b01aeab253d4/how_to_use_yes_man_in_a_sentence.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83d411eb-0480-40f8-afdb-3631307d8f5d/can_you_put_a_box_spring_on_ikea_slats.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b1bb0a2-d303-4763-8fff-a2079f26e8ae/67383978659.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78644061-e53a-4116-bb7c-f1122c31fddb/the_tragedy_of_macbeth_act_2_scene_1_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dd43f1e-e116-4bfb-802d-d425cbf575f0/lulogovifopuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a1913d2-19bb-4969-ab97-4b47c4450cb6/how_to_solve_a_2x2_rubiks_cube_easy_steps.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c9498c3-1bd1-4929-bd29-ce82eced6148/timex_indiglo_alarm_clock_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d856b69f-fdf0-46bc-9581-61c287528634/the_birds_nest_cafe_new_orleans.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB7 5012 bytes
SHA-256: 072572ed18a14de4be446415710f9124954dd1965736f8b9e31cd851e9553697
font_01_sfnt_off0000fdf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF1 11168 bytes
SHA-256: f638bb4dc01d764fc143c47f3834fc9943d4e4f59f2007bf1bd0560356fd6b56
font_02_sfnt_off00012409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12409 16132 bytes
SHA-256: 29a60492f44b39d68fa00197234d6df9a0cf581d74754725da64c153577ac146