Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b5c2a247d902d15…

MALICIOUS

PDF

82.0 KB Created: 2021-05-03 16:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dfeb53edff7ec27ad0a2abce0b029082 SHA-1: d2278ebd20937744451f472395982fb307d9be8a SHA-256: 0b5c2a247d902d15a71384410a2e13b3b819edb81dc81b4674f06e1c9bca9c78
126 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URIs, many of which point to disposable hosting and are likely part of a link farm designed to obfuscate the true destination. The presence of these links suggests an attempt to redirect users to malicious sites for phishing or malware delivery, aligning with the T1566.001 (Spearphishing Attachment) technique. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://nipisod.ru/strik?utm_term=panasonic+blu+ray+dmp-bdt220+owners+manual
    • http://fuckfrsky.com/kaabil_movie_torrent_downloadly0tb.pdf
    • http://pr-bux.online/gartner_careers_twitterrzh1g.pdf
    • https://static.s123-cdn-static.com/uploads/4425737/normal_5ffd374617015.pdf
    • http://fitness1.space/which_cars_have_homelinkdh01o.pdf
    • https://cdn-cms.f-static.net/uploads/4380411/normal_605b1d0835519.pdf
    • http://copyrighthelpcentral.com/kupizolixawiwomoniger9lt.pdf
    • http://letxxnx.org/77233306689du7rn.pdf
    • http://kojazunupetip.mygamesonline.org/anti_magic_academy_novel.pdf
    • http://awpmode.com/janimifovadegukanibazdrqok.pdf
    • http://vubitim.sportsontheweb.net/31166917040.pdf
    • http://shtampshop.ru/northstar_3_reading_and_writing_4th_edition_answer_keyj9f2i.pdf
    • http://itclick.pro/lazopefesifo8zzz6.pdf
    • http://xofofumireke.mypressonline.com/lafuxezevuwoveboxis.pdf
    • https://cdn-cms.f-static.net/uploads/4479474/normal_601455a43b972.pdf
    • https://cdn-cms.f-static.net/uploads/4413346/normal_605d7a0e76ce5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://guxejusoselota.myartsonline.com/doxazosin_davis_drug_guide.pdf
    • https://0eb00d84-361a-45dc-b346-1af5c8eb785c.filesusr.com/ugd/d79848_7942cd9fcee8467fa8fc38e74ad619b1.pdf?index=true
    • https://d89a15f7-21b5-45f0-b9b4-bc5b7be68842.filesusr.com/ugd/18e821_4e007fab545d4db3ab85e0591bf32f55.pdf?index=true
    • https://3a7b682b-4b85-4b21-836a-a34929c8735b.filesusr.com/ugd/0cd3a8_d39a0eea0bc2415ca6ea661c9dab593b.pdf?index=true
    • http://ruruwuvatokatal.onlinewebshop.net/dowapipewulutudalope.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_off0000ed23.bin
22f17baf23f49a1cc20d16f7e65c0bf524dc9989345e85c61d112ecd0b56af00		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED23 5296 bytes
font_01_sfnt_off0000ff78.bin
a8f85d09fecd30fffd869aee24bcd9b4fbaf16ab3cd3b665c84134c89a90532e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF78 5860 bytes
font_02_sfnt_off0001136b.bin
60e724033db95bb419a63490868b4e549ec97506ed61c1f93328c6f3a309c42b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1136B 11620 bytes

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