Malicious PDF — malware analysis report

Static analysis result for SHA-256 85da07870dd0901f…

MALICIOUS

PDF

101.7 KB Created: 2021-03-05 12:35:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 9aba52db93c2f13361ba256fd75757ea SHA-1: 320bfe0a7b584e837ecee8d91a98ef448f88d242 SHA-256: 85da07870dd0901f1e48989f882c84b02ffc3c8e7836b617f02086812b68649c
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable hosting, indicating a link farm or SEO abuse tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as phishing or a trojan. The embedded URL 'https://mezovuduw.ru/award?keyword=kenwood+tm+261+programming+software' is a primary indicator of the malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://mezovuduw.ru/award?keyword=kenwood+tm+261+programming+software PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4471686/normal_60003e95476d0.pdfIn PDF document text
    • https://feronokemafa.weebly.com/uploads/1/3/1/1/131164109/2251883.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493541/normal_5fda369abe778.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369310/normal_5ffc4eae6417c.pdfIn PDF document text
    • https://nigelatadumave.weebly.com/uploads/1/3/4/6/134615228/luririsegagoruf_debogalasufiwu_gabobifusaxija_rutibelexanojot.pdfIn PDF document text
    • https://zigajimimokok.weebly.com/uploads/1/3/1/3/131383588/5569776.pdfIn PDF document text
    • https://xorewodanuvidiw.weebly.com/uploads/1/3/1/3/131381095/xekofeji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376096/normal_6011a3c8d4b94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404296/normal_60204daa12bf6.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/a60702d8-b909-4292-874c-772667794b8e/xaraberosefawek.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/response_lawsuit_answer_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7e26673-14c6-4706-8cfc-bda9dd834081/how_to_convert_keynote_to_google_slides.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/asap_condensed_font_free.pdfIn PDF document text
    • https://02796127-04ec-4c85-b270-c6f7310ebb18.filesusr.com/ugd/ce0e6d_040ac815c32c4342bc9d850317e3bd89.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a5f23f6-1a17-4f38-af1d-5014955e7012/organic_chemistry_multistep_synthesis_practice_problems_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b39e22de-035f-4250-9502-c711a2292ac5/most_accurate_chronological_bible_reading_plan.pdfIn PDF document text
    • https://e40da922-b0e4-44be-9878-2d4898ccab21.filesusr.com/ugd/3a38e0_d57870cae1f342598bc56371c76c1a60.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d845904-74b0-4acb-b47c-7bc5d74ae2dc/mozilla_firefox_45_esr_portable.pdfIn PDF document text
    • https://s3.amazonaws.com/girilifawuxi/windows_defender_update_for_win_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d21cb19-6557-48dc-8f8e-75dd68a69257/tamewaxupisowesezifatar.pdfIn PDF document text
    • https://s3.amazonaws.com/wujafivabipo/80347346465.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibudasagas/android_17_kills_krillin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1967697a-ce8f-4d91-8891-7fc2f14018a7/mirowanexotafek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1aba26b4-7ddc-45bb-a914-8262fa3b53a4/panupufuwutalizexarefo.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_off00013c93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C93 5728 bytes
SHA-256: f7484ad2106dbc67945f8587c413bbfbcc682ae19467486ef48e99686fef1005
font_01_sfnt_off00015023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15023 10436 bytes
SHA-256: 8fb9b4c1f4ede96f1d51431015668cba4f2b9c3e8b206ac9233b335f153a2e1a
font_02_sfnt_off00017413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17413 16104 bytes
SHA-256: cd481ae0c6fd1d1450378d395d947ac520d4497346b2b975ad242cb560c7ef6f