Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b2d37861ae3960c…

MALICIOUS

PDF

84.4 KB Created: 2021-03-14 20:54:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3de9ca23cf0a83e1f1a853fb44acff4 SHA-1: 7cdbaf8d3c41ca8b696be5140db116dded4e1311 SHA-256: 5b2d37861ae3960cd6f11aefa353d5145b8bb75f05cd52503789c84474c431a5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to manipulate search engine results or redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate this PDF is malicious, likely a phishing or spam distribution tool. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/wix?keyword=witcher+2+prima+guide+pdf
    • https://lanokonemuke.weebly.com/uploads/1/3/5/3/135309959/xagar_xubuxowidope_wobakemenak_gikejisifor.pdf
    • https://nukusuruv.weebly.com/uploads/1/3/1/8/131857442/vavonoj_winibafixopu_vikimur_xomox.pdf
    • https://xomuxojevasew.weebly.com/uploads/1/3/4/0/134096468/7ff50dbbc8bd06.pdf
    • https://rowemuvirota.weebly.com/uploads/1/3/6/0/136089617/c12f9a6cfe.pdf
    • https://zegilaritapedu.weebly.com/uploads/1/3/1/4/131438092/3266120.pdf
    • https://cdn.sqhk.co/wagomito/f9ggBSU/54345297771.pdf
    • https://furetexagorude.weebly.com/uploads/1/3/5/9/135958868/moxebunezup-xibivapoladotap.pdf
    • https://cdn.sqhk.co/wajidafix/jF7hejf/roblox_get_free_robux_no_human_verification.pdf
    • https://beperupofifu.weebly.com/uploads/1/3/1/6/131636755/wagewawagax_roletakak_xibewelimonila_tozobikixile.pdf
    • https://cdn.sqhk.co/pafatewodoju/nihgh6p/free_streaming_news_channels.pdf
    • https://rubexanow.weebly.com/uploads/1/3/5/3/135346757/1569e.pdf
    • https://libodarupebixab.weebly.com/uploads/1/3/0/9/130969674/murukudutidup-bulaforuparokib-zupazo-milelamiz.pdf
    • https://disadaniti.weebly.com/uploads/1/3/4/4/134463451/kilubawifejivomi.pdf
    • https://kujakaxu.weebly.com/uploads/1/3/5/3/135347331/6489237.pdf
    • https://fojiwuduz.weebly.com/uploads/1/3/5/3/135309278/vipomuxivules_sedetalipok_lijewiwadis_wakazis.pdf
    • https://pepadamive.weebly.com/uploads/1/3/4/4/134468065/bawixotalaxe.pdf
    • https://mamufitixiru.weebly.com/uploads/1/3/4/6/134640278/jilisajinewax.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9e22dc04-f783-412a-8ec6-4c64449ce668/what_is_an_ivr_pin_presto_card.pdf
    • https://uploads.strikinglycdn.com/files/8d6d1691-6189-4774-a7a8-97ab88e290b4/how_to_dress_up_for_office_party.pdf
    • https://uploads.strikinglycdn.com/files/a1b9b485-841e-41aa-bfb0-26c9a240e0a5/what_to_check_for_when_buying_a_used_car_from_a_dealer.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_off0001084a.bin
f7f8d5411adb0ed9c51986c90a21d8ecf0c35396830de274d65758bc04b3e69d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1084A 5504 bytes
font_01_sfnt_off00011aeb.bin
d447f5d47cff343b4ef8cc4fefab90fca8bf589bd110eeead90c2e3bd53ce2a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AEB 12320 bytes

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