Malicious PDF — malware analysis report

Static analysis result for SHA-256 e598a15fb0e8a0b6…

MALICIOUS

PDF

83.0 KB Created: 2021-03-25 03:09:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6c4c61d2c48a0c9bab4233e05579b54 SHA-1: 505f6d431e24cf022b65d943754d0f476e30613f SHA-256: e598a15fb0e8a0b6cd34f8eb7237aa05fe08694a9d8afb13db4fa13165e2e263
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' suggesting a large number of outbound links for SEO manipulation or to host malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/wix?keyword=tera+brawler+pve+guide+2019
    • https://cdn.sqhk.co/ludukuni/egjZgc5/63819756744.pdf
    • https://static.s123-cdn-static.com/uploads/4369777/normal_5ff67635ac66a.pdf
    • https://cdn-cms.f-static.net/uploads/4481417/normal_604ba9e4e94bf.pdf
    • http://begdas.space/what_do_the_different_colours_of_period_blood_meant1h35.pdf
    • https://cdn-cms.f-static.net/uploads/4385412/normal_600a4c9b3980d.pdf
    • https://cdn-cms.f-static.net/uploads/4477886/normal_5fe7f0b7e9544.pdf
    • http://intekzafast.online/business_communication_skills_course_in_pune1jl6b.pdf
    • https://cdn.sqhk.co/gavezexu/4jjeDTF/diparepinewipowixuxi.pdf
    • https://xasonametig.weebly.com/uploads/1/3/2/3/132303127/2030961.pdf
    • https://cdn.sqhk.co/konanetufuda/hgjifie/fun_things_to_do_in_philly_this_week.pdf
    • https://static.s123-cdn-static.com/uploads/4464082/normal_5fdd6c315a784.pdf
    • http://lunesygets.xyz/sql_format_date_in_selectd7uqp.pdf
    • http://weramixizagob.22web.org/27920297394.pdf
    • http://samo-katim.ru/14291179129aeuof.pdf
    • https://static.s123-cdn-static.com/uploads/4443812/normal_60053192743ce.pdf
    • https://cdn-cms.f-static.net/uploads/4367311/normal_6030a6868a051.pdf
    • https://cdn-cms.f-static.net/uploads/4426966/normal_605bc00e88577.pdf
    • http://mitidogifomasis.iblogger.org/when_was_the_dell_optiplex_390_released.pdf
    • https://vedewoxid.weebly.com/uploads/1/3/0/7/130738666/binogunulubemob.pdf
    • https://biwomewiwuxe.weebly.com/uploads/1/3/4/1/134131409/1243144.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wajiletum.epizy.com/bbc_6_minutes_english.pdf
    • http://bezopebadutaz.rf.gd/75653886244.pdf
    • http://didigenekogama.epizy.com/81739461190.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010604.bin
2ec3371d30d7a25c724e1ae7ad8d68ba273c5463d9fe4d9097da67d2f7a2b823		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10604 5672 bytes
font_01_sfnt_off00011979.bin
551b0397dd55c87b90a3ad858d894e079a09c42fc3f6df210919e87272ad9251		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11979 10840 bytes

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