Malicious PDF — malware analysis report

Static analysis result for SHA-256 6954186b1db6df2e…

MALICIOUS

PDF

68.2 KB Created: 2021-02-15 11:40:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7b80caf069e1608f50f8d7ecf5c30ee5 SHA-1: 4165b4d2cb4ef13d650fc77d3bda38f68b18305f SHA-256: 6954186b1db6df2ede5745ea0408f29b75ac814bf50f1d1c87986e6ca766e327
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many pointing to disposable domains, suggesting it's part of a link farm designed to redirect users to malicious sites. The heuristic 'SE_LOLBIN_RUN_COMMAND' also indicates potential execution of commands, possibly related to the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://jottigo.ru/strik?utm_term=matlab+for+loop+multiple+plots PDF link annotation
    • http://biggymstoe.com/85675876069kh328.pdfIn PDF document text
    • http://hackins.site/69853558921yi0nt.pdfIn PDF document text
    • https://cdn.sqhk.co/jujadiziga/Kgjgcgi/let_s_get_bubble_tea_shirt.pdfIn PDF document text
    • https://cdn.sqhk.co/xorazasuno/p9diiSv/vofixuxisirodiredikuti.pdfIn PDF document text
    • http://effektzhizni.ru/sport_racing_apk_modme3xo.pdfIn PDF document text
    • https://cdn.sqhk.co/sixitigoxeto/aoVjgQt/zixomokereganivoke.pdfIn PDF document text
    • https://cdn.sqhk.co/foroboreb/fgblie7/space_rangers_2_hd_a_war_apart_wiki.pdfIn PDF document text
    • https://cdn.sqhk.co/buxifuludo/jOgiHuH/the_walking_dead_episode_where_zombies_talk.pdfIn PDF document text
    • https://bujopulima.weebly.com/uploads/1/3/3/9/133997272/suxovit-gemavudot.pdfIn PDF document text
    • http://baltika-trans.com/536435357402tuma.pdfIn PDF document text
    • http://dresdenpharma.ru/futaba_s3003_datasheet6jy0y.pdfIn PDF document text
    • http://rodsfish.club/ts4_cc_maxis_match_skin46cmd.pdfIn PDF document text
    • http://reawolt.online/fire_risk_assessment_method_for_engineeringczv9b.pdfIn PDF document text
    • https://cdn.sqhk.co/pabelewexo/idjgthf/we_love_you_coloring_pages.pdfIn PDF document text
    • http://reawolt.online/fire_risk_assessment_method_foIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://punozow.epizy.com/kesolevanika.pdfIn PDF document text
    • http://gamupuzif.epizy.com/48345720675.pdfIn PDF document text
    • http://vemevusakeke.epizy.com/chinese_keyboard_app.pdfIn PDF document text
    • http://bubexixan.epizy.com/marginal_distribution_joint.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_off0000ccac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAC 5192 bytes
SHA-256: 2cfe29477f94f61a72d9d7902d30c71558bc3de4341c7482ed6ab7a216e43a3b
font_01_sfnt_off0000de4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4A 10884 bytes
SHA-256: c66889e7bcdba0aac6e7d613bcd797057989290e81439faf13eafea927b51dd7

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