Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fc1088a7eb3798d…

MALICIOUS

PDF

72.7 KB Created: 2021-03-10 08:09:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: bb32fd77d1d096da560cb9b21c4e9554 SHA-1: 17853d14a4aecf5b0f699b73b6ff042081ab3194 SHA-256: 6fc1088a7eb3798dbf8c16c3b4f96facd8c9134d8108f8571fc29e3a934e1f31
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://seumenha.ru/strik?utm_term=dell+u2415+monitor+mount PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460461/normal_601aa5f0c710d.pdfIn PDF document text
    • http://pemufosapakem.mypressonline.com/canon_mg3520_wireless_setup_iphone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368989/normal_6041910d7e285.pdfIn PDF document text
    • https://kigolakelo.weebly.com/uploads/1/3/1/3/131380934/3202006.pdfIn PDF document text
    • https://bepixumute.weebly.com/uploads/1/3/5/3/135302933/gotibabeluloxipug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389601/normal_6039b0e91bbc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389394/normal_60460d9eb9f75.pdfIn PDF document text
    • https://voropulunonuz.weebly.com/uploads/1/3/5/3/135316946/4438244.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/jijari/22306577885.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adf97ff2-f6eb-40aa-a6ef-315b0e01cd88/nitro_converter_free_download_for_windows_10_64_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/xibezumi.pdfIn PDF document text
    • http://jetotajasavesi.atwebpages.com/the_christmas_caroler_challenge_2020_judges.pdfIn PDF document text
    • http://xutagefev.epizy.com/duturi.pdfIn PDF document text
    • https://s3.amazonaws.com/jodabiladezot/losogifivulusix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc1ac696-79ba-49d4-a501-61753fd2a4d5/zejexefubaxabawedafovabo.pdfIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/86070269581.pdfIn PDF document text
    • http://pikazunelovo.epizy.com/bsc_syllabus_maths.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_off0000dddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDD 4836 bytes
SHA-256: 6ca81d8d3ef79f20d20337bd16718549a6dcc88759acd51a14b2e22e9789bc68
font_01_sfnt_off0000ee50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE50 11444 bytes
SHA-256: 5539fb1ec4ca6035ed51411f90d848416ca6da9ceee9d2ebca35a80908d4d9e2