Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5ffeb30aa244d5d…

MALICIOUS

PDF

82.2 KB Created: 2021-04-30 23:19:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 90b48a38e75495dedca9362f50ff7ce1 SHA-1: ae40c53427f0c31c0bb8c2a3ee7b589d390de2d3 SHA-256: e5ffeb30aa244d5db9a5eec7e8013cbec1b1eb0504be64628a1b51277da25811
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, with one prominent URL pointing to 'vilenefex.ru'. The presence of a PDF link farm heuristic suggests an attempt to manipulate search results or direct users to malicious content. No scripts were extracted, but the overall structure and heuristics point towards a phishing or malicious content delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/strik?utm_term=give+me+liberty+chapter+17+quiz
    • https://static.s123-cdn-static.com/uploads/4403421/normal_5fca33b71c16a.pdf
    • http://sutovuresas.mygamesonline.org/pefezew.pdf
    • https://static.s123-cdn-static.com/uploads/4381737/normal_5ff2cc141996a.pdf
    • http://vipadobotisituz.mygamesonline.org/meaning_of_social_development.pdf
    • https://cdn-cms.f-static.net/uploads/4376379/normal_60146777162d3.pdf
    • https://static.s123-cdn-static.com/uploads/4497395/normal_5fccf16683ae7.pdf
    • http://kutejovanog.getenjoyment.net/what_to_do_if_your_amazon_fire_stick_wont_turn_on.pdf
    • http://bekopomulasebi.getenjoyment.net/tibetan_book_of_the_dead_bardo_thodol.pdf
    • https://static.s123-cdn-static.com/uploads/4478683/normal_5fedf28ecd291.pdf
    • http://kusafomidufe.mywebcommunity.org/college_attendance_management_system.pdf
    • https://cdn-cms.f-static.net/uploads/4409239/normal_601f11933d6c1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://d427386d-3434-45d9-8802-370857a594f4.filesusr.com/ugd/accd1f_d760a8a39d5449a68880c35557ce4c1c.pdf?index=true
    • https://s3.amazonaws.com/nasitevu/the_sandman_wrestler_now.pdf
    • https://e966359d-176b-477a-9ad9-c314bea94227.filesusr.com/ugd/fa6f14_6a05ddb0c38a4b63a6a11a1cb6f75363.pdf?index=true
    • https://s3.amazonaws.com/wizitifowubux/zepowivelavobapinami.pdf
    • https://s3.amazonaws.com/bulozor/commission_notice_guidelines_on_vertical_restraints.pdf
    • https://39472683-7d43-4bc3-882b-0947a83fd973.filesusr.com/ugd/544c7e_f33dd95654074abeac50d90c1fbc0d38.pdf?index=true
    • https://s3.amazonaws.com/mefonevimimix/naa_autograph_songs_teluguwap._net.pdf
    • https://s3.amazonaws.com/bevekizadoxuj/doggie_daycare_business_plan_template.pdf
    • https://b9eb3541-094c-4606-b101-17c2291fd6e1.filesusr.com/ugd/a18601_f05eedcb0efb4fd8a268c603db6a6db0.pdf?index=true
    • http://sanugifop.atwebpages.com/10451499690.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f645.bin
016ca84dcabac649af89417774e31bd031a3021fd5db7f9cc535c93219c4f2ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF645 5300 bytes
font_01_sfnt_off00010877.bin
823e01f02192b9abe338d4870753e93182ddb07248c7dee4c288dbd2735c9b92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10877 10944 bytes
font_02_sfnt_off00012d4e.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D4E 4324 bytes

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