Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e34a48e1ae1ac5d…

MALICIOUS

PDF

76.0 KB Created: 2021-03-07 11:07:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 220fa0c6215503ba69421a7a90458365 SHA-1: 2188adc80d74c1d18c6afd8e8c9620e5addf2566 SHA-256: 9e34a48e1ae1ac5da5b8f31bb59a93362549469483a3db08bb6e352b2a3f9712
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, contains keywords related to "Cisco official cert guide 350-401", indicating a lure to potentially malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, likely due to its structure and embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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
  • 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://vilenefex.ru/wix?keyword=cisco+official+cert+guide+350-401
    • https://xaxibilezulaf.weebly.com/uploads/1/3/4/0/134096047/pazuvekibibom.pdf
    • http://gufurebu.medianewsonline.com/zowilujam.pdf
    • https://fumeseteno.weebly.com/uploads/1/3/1/4/131483149/fabajapagazid.pdf
    • https://surugatolezijef.weebly.com/uploads/1/3/4/6/134631687/bokixulag.pdf
    • https://pobunusegem.weebly.com/uploads/1/3/4/4/134460984/f104e8.pdf
    • http://kipegujodup.getenjoyment.net/ramimixupozoxoxowuz.pdf
    • https://movabeze.weebly.com/uploads/1/3/0/8/130814110/kokotapajerapires.pdf
    • http://xamoxipuwizutux.scienceontheweb.net/16252500477.pdf
    • http://juwupexutaval.mywebcommunity.org/toxibovesisixosape.pdf
    • https://ziduxaxeg.weebly.com/uploads/1/3/1/3/131380546/4730120.pdf
    • https://bunivuwavimi.weebly.com/uploads/1/3/4/7/134706582/luvitumapitejov.pdf
    • http://xojuxelase.medianewsonline.com/vosaro.pdf
    • http://kopuvimu.scienceontheweb.net/2nd_edition_original_dd_character_sheet.pdf
    • https://wexarasi.weebly.com/uploads/1/3/4/3/134351888/gemavuludovizo_duvomuv_tijifeduxezav.pdf
    • https://zesijijonade.weebly.com/uploads/1/3/0/7/130776416/wuxij.pdf
    • https://sositero.weebly.com/uploads/1/3/4/3/134389363/soraninel.pdf
    • http://rafupofamurawaf.mygamesonline.org/what_are_the_elements_and_principles_of_sculpture.pdf
    • https://fivixevovisobav.weebly.com/uploads/1/3/1/3/131380347/5780396.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ae0ecf71-49bb-4ac4-bba4-d0f2a20d1af9.filesusr.com/ugd/668a47_96e53e4ae98148d6b3cdd70f6f0d5d9f.pdf?index=true
    • https://d6236f05-450e-4b96-9875-1783d83c708b.filesusr.com/ugd/912de2_4ddccd34e1cc456c93b1afe58df0bab0.pdf?index=true
    • https://9305c775-266c-4126-9ef9-90a5cffee957.filesusr.com/ugd/c3f88d_081b10a2558b4446b250b6de4c4fb45e.pdf?index=true
    • 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_off0000e8eb.bin
ac0f5491c03aa0c19e6c9f8456ec659cdc76f26d077dc31dd9a4e8181f009244		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EB 5696 bytes
font_01_sfnt_off0000fc6d.bin
4bbb319d46a2e20ca20f8d03c301ceed051430edc6c6aec83411532fb0af88b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6D 11328 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.