Malicious PDF — malware analysis report

Static analysis result for SHA-256 4953fb3f0218928d…

MALICIOUS

PDF

74.9 KB Created: 2021-04-06 21:27:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5359a968c433e07bbad6171a70c9d0c5 SHA-1: 2b91666d8119d203f4e155b4a52267880efcc5e5 SHA-256: 4953fb3f0218928d69586392aa6b4ce2fc5d3f367332fbdb839d1586f8cd269f
186 Risk Score

Malware Insights

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

The PDF contains a mass external link farm on disposable hosting, with 30 links pointing to various domains, including a primary lure at 'fokemale.ru'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further malware or phishing content. No scripts were extracted, but the structure suggests a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://fokemale.ru/strik?utm_term=strategic+marketing+management+definition+pdf PDF link annotation
    • http://luxuwum.mypressonline.com/wefokesekawojo.pdfIn PDF document text
    • https://nasewinadomev.weebly.com/uploads/1/3/4/5/134521200/lorozinisit-lapozidefa-xoxedute-wuboda.pdfIn PDF document text
    • https://livaruzurakit.weebly.com/uploads/1/3/4/4/134432061/wogidinaxanegemo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://medexode.atwebpages.com/60542062222.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/zotovawibumadegejubed.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/giwisaxopofawimodisik.pdfIn PDF document text
    • https://s3.amazonaws.com/xugigabitulu/82887134951.pdfIn PDF document text
    • https://6d8b2927-5c4d-40df-b593-c6bd35e19528.filesusr.com/ugd/1adac8_f8cd852232554f16a698b80a397d697c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0132e0f2-762c-469a-ae99-8182b38a8e92/lou_gehrig_farewell_to_baseball_speech_analysis.pdfIn PDF document text
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_fd78733a347d4df2a4c08b3e679c38e4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/be3aa535-d057-467b-abf7-bccfa17c27fb/hp_laserjet_p4015n_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b81edfed-47e4-4dc4-950d-28f16d726631/whirlpool_quiet_partner_ii_sanitized_light_blinking.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84d0a3e2-efdc-4c85-bd46-5ab84d9cc371/jeziputanolebi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3080a9a-544b-47a8-b082-9d42d0d7a128/batman_the_killing_joke_joker_and_barbara.pdfIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/agenda_google_doc_template.pdfIn PDF document text
    • http://kakasis.onlinewebshop.net/capitalismo_y_comunismo.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_off0000e80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80A 5432 bytes
SHA-256: 0b63910add6659741af030ed60a35168f0f278161e151eedb3ddd7dedfcaccd7
font_01_sfnt_off0000fa77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA77 10648 bytes
SHA-256: 35ef222bce3ea9a32f4716ae90e8a457741106a97127d94e5f9af2abd831ec86

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