Malicious PDF — malware analysis report

Static analysis result for SHA-256 167b8b9f7fa1d7f5…

MALICIOUS

PDF

74.7 KB Created: 2021-03-19 01:33:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 58d40d8c8b357ad54de8955b8f4ef39c SHA-1: 9b7d83101560ca289b1a092520a2936ae08c6882 SHA-256: 167b8b9f7fa1d7f59ebf7d076ec1b495fdf9ed59125ab66aeeb95fa32f862f3c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a prominent one leading to 'baarspo.ru'. This URL, along with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM', indicates a likely phishing or malware distribution attempt disguised as a search result. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://baarspo.ru/strik?utm_term=quran+in+arabic+with+english+translation+audio PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4500446/normal_5fdc1f07aa68e.pdfIn PDF document text
    • http://copyright-notice-ig.com/19136052040h1ktb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502567/normal_6047a573c7866.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424689/normal_60100961b7616.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421781/normal_5fdb98a232bb6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478928/normal_5ff2598074c93.pdfIn PDF document text
    • http://nuveclovet.xyz/what_does_it_mean_when_my_application_is_in_reviewco58l.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447437/normal_5ff0ee48b1e2a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373520/normal_5feb0b1667173.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449968/normal_603880ac64dfa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482617/normal_602ba28c51031.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499979/normal_6008f4466d2f5.pdfIn PDF document text
    • http://idealslim-ordina.site/numudolimesvb8qj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pirosisob/baby_einstein_neptune_jumper_replacement_parts.pdfIn PDF document text
    • http://pusevim.epizy.com/az_score_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/gupojakami/vosemomajaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03714f8c-90f2-4d11-a9f1-4f124b3946d7/bolunuwotubazanuburozufib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/289ee64b-4424-477b-92cb-37f3a9fbbc8e/mefezisufutujegipujizujo.pdfIn PDF document text
    • http://zetijub.epizy.com/iphone_6_emulator_for_pc_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8e1a927-709f-416c-8339-2eaf8a816d84/moen_monticello_kitchen_faucet_parts_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87ca7b64-511f-4d99-98a2-3396f6444b71/how_to_read_regression_statistics_in_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/16849351026.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_off0000e6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AB 5496 bytes
SHA-256: 944ef3a824f7cd1fa61e333e7572487445785fd2ab75d54c33bb1529f63a02c8
font_01_sfnt_off0000f959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF959 10696 bytes
SHA-256: 0c9d9cde311dab0bd0684deb7b1193472d196615f61bd5be1de76718b8302e85

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