Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b6dfa73a3645906…

MALICIOUS

PDF

86.8 KB Created: 2021-02-06 12:46:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4678e23537ab781769cfa5eb3ae3cab8 SHA-1: 347526b965e3bb70ca0df513a1a7ca7f244629c1 SHA-256: 0b6dfa73a36459060ea10ddd20bd3127597dafc98ce123ce661ac1b2c2526a1b
186 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics as a link farm, containing a large number of external URIs pointing to potentially malicious domains. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the structure suggests it's designed to lure users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/123?utm_term=mit+enterprise+architecture+framework PDF link annotation
    • https://cdn.sqhk.co/wunasesev/miahigg/edit_photos_and_videos_on_iphone_add_text.pdfIn PDF document text
    • https://cdn.sqhk.co/limizolaxa/f4gfqjb/wekuloj.pdfIn PDF document text
    • https://zeteparikimifol.weebly.com/uploads/1/3/1/6/131637109/6867733.pdfIn PDF document text
    • https://besunuvoduzusub.weebly.com/uploads/1/3/4/2/134266379/durilojax.pdfIn PDF document text
    • https://cdn.sqhk.co/xudevekelefe/iijgIjf/contacts_online_air_optix_for_astigmatism.pdfIn PDF document text
    • https://cdn.sqhk.co/roretuduva/dggYEgg/89912458010.pdfIn PDF document text
    • https://makukojubava.weebly.com/uploads/1/3/0/7/130739489/wufinesivejabiz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467274/normal_5fe002b68cab3.pdfIn PDF document text
    • https://cdn.sqhk.co/pevipulakas/Nhhih60/felipodavolurokepupivil.pdfIn PDF document text
    • https://cdn.sqhk.co/difigobon/aI4ggif/93431185825.pdfIn PDF document text
    • https://fizupubiwox.weebly.com/uploads/1/3/0/7/130775838/ribiwotosebuma.pdfIn PDF document text
    • https://cdn.sqhk.co/zesonixiv/cdPhcH8/hangman_adam_page_wife.pdfIn PDF document text
    • https://xikisujegowo.weebly.com/uploads/1/3/1/8/131856166/9541929.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444853/normal_5fe89882acce1.pdfIn PDF document text
    • https://sakurulemiba.weebly.com/uploads/1/3/0/9/130969926/3879771.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/miledu/workplace_spirituality_and_job_satisfaction.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/ananya_birla_songs_better.pdfIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/bejeweled_android_apk.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000121d5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x121D5 24412 bytes
SHA-256: 4470c5e6d3b710396676b4751fa3c52dac3a111fc3c28e9eabc23b5506a82dad
font_00_sfnt_off0000ea8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8F 5384 bytes
SHA-256: 731d13ab2d257f1847910fe2b8e0eaa649f83b98d8a312d39dea76ab6eff3ba7
font_01_sfnt_off0000fcd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD3 10756 bytes
SHA-256: efd6c9c2048d272ffa89d9c83cce9af30d450917a4d5f52791afb2dfc749315f

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