Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4416b9a607c3ac2…

MALICIOUS

PDF

74.4 KB Created: 2021-02-22 22:11:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a9cbd589ecfeaab8c212963c8336c76a SHA-1: 1619f4d3e4a11f742bc9bca8407ebe9b6b37180f SHA-256: e4416b9a607c3ac20efaf593b3e4c49cffb685d527919eefe4c46c762559eec1
252 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable hosting or known redirectors, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crophysi.ru/wix?keyword=journey+to+careers+activities In PDF document text
    • https://cdn.sqhk.co/pufojoloz/ibuqKhc/65573542543.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404293/normal_60328bcb660eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499351/normal_5fd94957ca177.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486374/normal_5fc595e082c3e.pdfIn PDF document text
    • https://cdn.sqhk.co/kitaparek/7jc8Hih/petrol_station_finder_uk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493905/normal_6027b8109658d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414679/normal_6025898a49217.pdfIn PDF document text
    • https://buporinedo.weebly.com/uploads/1/3/4/0/134041533/1102079.pdfIn PDF document text
    • https://lumuvimusu.weebly.com/uploads/1/3/4/7/134719948/zuxubisesolonilepi.pdfIn PDF document text
    • https://cdn.sqhk.co/mijajijem/P2iivcN/street_fighting_3_king_fighter_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473919/normal_60303e88f20ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422144/normal_60112b4bca533.pdfIn PDF document text
    • https://kapizufon.weebly.com/uploads/1/3/4/4/134486886/dudepabuw_laxupu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468267/normal_6011e677280bf.pdfIn PDF document text
    • https://cdn.sqhk.co/fudimesa/idWsqgf/tap_tap_heroes_loyal_chicken.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pizubape.rf.gd/82514593205.pdfIn PDF document text
    • http://zerujafulo.rf.gd/98408335569.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EF 4912 bytes
SHA-256: a91538ace60b76c3c48ae80e88ea9848ee82ef21ae23a2d4d5b55c39a27f8ea1
font_01_sfnt_off0000f9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C8 10240 bytes
SHA-256: f87fb6fe73058a14a97e31bddf443ca77d0623a418a7a692f51df200dd35a40a

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