Malicious PDF — malware analysis report

Static analysis result for SHA-256 b84cf4b66e195890…

MALICIOUS

PDF

82.9 KB Created: 2021-04-06 23:31:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 9cb2c407342af8842ab1d62dd1b96612 SHA-1: 7e19d8728214a7b417f4c963c5b38f1ffd2b322d SHA-256: b84cf4b66e1958900f4f0761910af9e85c717ae523d0ec4c4321bba4f4c7bf96
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The embedded URLs, such as 'https://fokemale.ru/strik?utm_term=barkskins+sel+family+tree', are likely used to redirect users to malicious sites. No scripts were extracted, but the PDF structure and heuristics point towards a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fokemale.ru/strik?utm_term=barkskins+sel+family+tree PDF link annotation
    • http://cabinetsapp.xyz/arashi_untitled_album7l1ih.pdfIn PDF document text
    • http://bionatur.space/encyclopedia_of_spiritsf598o.pdfIn PDF document text
    • http://starkrobotics.org/tamasha_full_film_hdqfbwf.pdfIn PDF document text
    • https://rulozakowix.weebly.com/uploads/1/3/4/7/134730123/fcdc7436f0.pdfIn PDF document text
    • https://nenesezeli.weebly.com/uploads/1/3/0/7/130775424/9874780.pdfIn PDF document text
    • http://waludojugemupa.iblogger.org/how_to_play_behind_the_wall_of_sleep_smithereens.pdfIn PDF document text
    • https://wemowojek.weebly.com/uploads/1/3/5/9/135993501/1498351.pdfIn PDF document text
    • http://tuvuleworejuxi.22web.org/find_all_of_the_missing_angles_worksheet_answer_key.pdfIn PDF document text
    • https://vokipokulolobu.weebly.com/uploads/1/3/4/0/134016984/180496.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3682d434-6e27-4ac8-9ac2-d3ec24fa429c.filesusr.com/ugd/9b5f63_b88d4e70222947c888d65a8bc94b41d0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0688bd63-194b-4cf3-8a95-517b1e7e9a83/kedufagon.pdfIn PDF document text
    • http://rejazimuperolik.rf.gd/how_to_introduce_yourself_in_an_interview_presentation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0282a7bf-a579-4bc4-bd8b-a4011a8b91d7/28762264765.pdfIn PDF document text
    • http://doliwoxebokuk.rf.gd/13917606383.pdfIn PDF document text
    • http://xurolawewetaw.epizy.com/literatura_e_resistencia_alfredo_bosi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1427f914-70f5-4a4b-ae15-250e5210503f/kekepikoxifonol.pdfIn PDF document text
    • https://3ae4d138-4ba3-4962-98fb-1b98b40a6a82.filesusr.com/ugd/38062a_8d189d3bc4b1423d8b1c48582c086767.pdf?index=trueIn PDF document text
    • https://832c8a8d-f05d-46e3-9166-97d9de82ace4.filesusr.com/ugd/432509_8fdf1fc2cf984b4bb13846609b3c38ca.pdf?index=trueIn PDF document text
    • http://zesositug.epizy.com/contratto_di_governo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/832e89d8-0b4b-4727-9bae-36756536a253/18816369984.pdfIn PDF document text
    • https://4465b75e-e642-4f53-8c89-e22f0b9d4994.filesusr.com/ugd/ecd213_750ab27d696043c2a8b63ab795d6b592.pdf?index=trueIn PDF document text
    • https://123949be-7110-4ba3-a240-a7df06fb38ce.filesusr.com/ugd/80fd5d_538fe555db3f4c8585fdf5d09c03736a.pdf?index=trueIn PDF document text
    • http://vutuzepen.epizy.com/zizevota.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12214aa6-b25e-43a5-8db3-f3ba4d614958/us_army_field_manuals_for_sale.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BA 5128 bytes
SHA-256: ed90c2f227cae42305ccadbd2c126b63c94e44dc4a5e0ae7034a0ed5004841f9
font_01_sfnt_off00011721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11721 11556 bytes
SHA-256: a72448c4ec7e3ba901ca4aace42ddea789fda6d92318827132902fe3fc177ee6

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