Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff01c849074e4b14…

MALICIOUS

PDF

80.9 KB Created: 2021-05-20 05:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15a29f70ae57af5c43537caac6fda40b SHA-1: 6f421549e70c060b73a452ab60a108fb462f04b6 SHA-256: ff01c849074e4b141f80d957f408df792ef021fdd859255cead0c6434c732d01
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or SEO poisoning tactic. The document body is heavily obfuscated, but the presence of external URIs and the PDF_SEO_LINK_FARM heuristic strongly suggest the primary goal is to redirect users to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/strik?utm_term=qualitative+research+design+maxwell+pdf
    • https://kofepuxola.weebly.com/uploads/1/3/4/7/134718869/riviguf.pdf
    • https://static.s123-cdn-static.com/uploads/4379045/normal_5ffde2a7e33eb.pdf
    • https://vebaxifi.weebly.com/uploads/1/3/4/3/134360040/449053.pdf
    • https://biteledazuxol.weebly.com/uploads/1/3/4/3/134315761/450939.pdf
    • https://static.s123-cdn-static.com/uploads/4444657/normal_5fe23fffb6241.pdf
    • https://kufavugozit.weebly.com/uploads/1/3/5/3/135309998/1554239.pdf
    • https://palobakuk.weebly.com/uploads/1/3/4/5/134523632/ziwulelasozu-jidepujefu.pdf
    • https://static.s123-cdn-static.com/uploads/4493578/normal_5fc88044c0307.pdf
    • https://static.s123-cdn-static.com/uploads/4385235/normal_5feda187206f1.pdf
    • https://zikegebuner.weebly.com/uploads/1/3/4/8/134856814/4371857.pdf
    • https://tedinuvade.weebly.com/uploads/1/3/4/3/134348171/b86828bad.pdf
    • https://butusokusumowa.weebly.com/uploads/1/3/5/2/135294155/a486ff090540de.pdf
    • https://cdn-cms.f-static.net/uploads/4492294/normal_5fd198c040edf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jezobasit/xisukamosep.pdf
    • https://s3.amazonaws.com/jajoxulabojaso/56162842272.pdf
    • https://s3.amazonaws.com/bisazabe/supplier_audit_report_template_word.pdf
    • https://s3.amazonaws.com/jotizifime/xoduka.pdf
    • https://s3.amazonaws.com/dazinibonofobi/at_the_airport_vocabulary_activities.pdf
    • https://s3.amazonaws.com/dozore/wunesebusadulu.pdf
    • https://s3.amazonaws.com/donarepemi/92911477052.pdf
    • https://s3.amazonaws.com/jadere/nenodoxomawaguxipobele.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_off0000fd8b.bin
d957562ece17c06343655d66fece6856b2d3b3c6d4fade57e35bbb3f4d73d5a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8B 5852 bytes
font_01_sfnt_off00011166.bin
dcf2b32214a3dc1b714c920cd222561c30f51fb0c8587b28228f0b7f7a52c246		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11166 10768 bytes

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