Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce31494eb2388a5a…

MALICIOUS

PDF

68.5 KB Created: 2021-02-04 14:51:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f22ac234f05eb4dde8ed12b73dcc54e7 SHA-1: 34d74ce51b05af74d78aa7fc48241ae7db552dc0 SHA-256: ce31494eb2388a5af829e79d2997904b659f6745da252142df126510ac30bbe9
186 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan. It contains a large number of external links pointing to various PDF files hosted on disposable domains, indicating a link farm or SEO manipulation scheme. The embedded URLs and the heuristic firings strongly suggest the document's purpose is to redirect users to potentially harmful content.

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://jacksth.ru/wb?keyword=2005%20chevy%20trailblazer%20manual%20shift%20override PDF link annotation
    • https://risegexof.weebly.com/uploads/1/3/4/6/134661868/zugerasoxulone.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477164/normal_5fc9c1e94cf60.pdfIn PDF document text
    • http://interior.estate/character_traits_graphic_organizer_3rd_gradescpz6.pdfIn PDF document text
    • https://vivimudovulab.weebly.com/uploads/1/3/1/4/131437737/135260.pdfIn PDF document text
    • http://zaliv2k20wowowowoow.xyz/pride_lift_chair_serial_number_lookugsi8v.pdfIn PDF document text
    • https://pavibizad.weebly.com/uploads/1/3/0/7/130740264/0b10dee7.pdfIn PDF document text
    • http://smartcoin.design/refesurepadoxet82o9.pdfIn PDF document text
    • https://cdn.sqhk.co/futidiwe/ahb0KWT/soccer_spirits_seventh_star_episode_1_english_sub.pdfIn PDF document text
    • https://lufeziwupidel.weebly.com/uploads/1/3/5/3/135345985/327d5f7.pdfIn PDF document text
    • http://edaruzal.xyz/fallout_4_script_extender_updateaavhn.pdfIn PDF document text
    • https://cdn.sqhk.co/kegufamop/CifUif4/dynamite_fishing_world_games_premium_mod_apk.pdfIn PDF document text
    • https://labatozun.weebly.com/uploads/1/3/1/6/131607827/2687069.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368230/normal_5fd7c82c16b54.pdfIn PDF document text
    • https://pareniwidof.weebly.com/uploads/1/3/5/3/135313819/d1806d7f3b74.pdfIn PDF document text
    • http://axacheat4.xyz/ip_man_torrentl1ee8.pdfIn PDF document text
    • https://juwomazitebuden.weebly.com/uploads/1/3/1/4/131414743/cd6bcc.pdfIn PDF document text
    • https://jutokikifugata.weebly.com/uploads/1/3/1/0/131070124/ginejazami.pdfIn PDF document text
    • http://samozanyat.info/kixureleewx79.pdfIn PDF document text
    • http://eushopvmn.site/kenanigigex5q8dx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000cb80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB80 5916 bytes
SHA-256: f465df299d39e3717fa3599387d0f1ff6395f3f59cedbec1f3535752461d3b50
font_01_sfnt_off0000df91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF91 10372 bytes
SHA-256: 89f67b0eb3f22455ca4cf6682ef77d5fdea2ea289bd8e273e5d02054f7a08865