Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5c3f4cfd89775e0…

MALICIOUS

PDF

69.1 KB Created: 2021-02-24 15:28:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c1054a1c0c48e33416b02799d36aa31e SHA-1: 5d2f48b3df9196825fb8c08b55e5bc16f296a81a SHA-256: e5c3f4cfd89775e0243f4143239870354faa9a1f15b09c0e1ec13a6e914e75e4
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a significant number of embedded URLs, many of which point to disposable hosting or redirector infrastructure, suggesting a link farm or phishing attempt. The presence of a link to a known malicious redirector further supports this. No scripts were extracted, and the document body was heavily truncated and unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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/123?utm_term=how+to+play+bongo+drums+beginners In PDF document text
    • http://palejep.22web.org/cron_job_format_in_jenkins.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450045/normal_5fe7081306801.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465694/normal_5fe76ecf87b09.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459318/normal_5fe0987aad648.pdfIn PDF document text
    • https://cdn.sqhk.co/jurufovowufu/gwvJFZU/raid_hq_hack_apk.pdfIn PDF document text
    • https://goluluvofa.weebly.com/uploads/1/3/2/7/132712214/a8c1ead2ffd9.pdfIn PDF document text
    • http://jiludedo.iblogger.org/school_uniforms_shops_near_me.pdfIn PDF document text
    • http://lokalumamone.iblogger.org/chac_mool_fuentes.pdfIn PDF document text
    • https://bilugiwunifi.weebly.com/uploads/1/3/1/4/131408415/kafoxu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389361/normal_5febd50fa716e.pdfIn PDF document text
    • https://vupixesit.weebly.com/uploads/1/3/2/7/132740805/zavex_natabipubivemor_mebetubot.pdfIn PDF document text
    • https://cdn.sqhk.co/famuxina/ge3hjij/68326897540.pdfIn PDF document text
    • https://lokamafurixese.weebly.com/uploads/1/3/4/5/134509290/a55db37a.pdfIn PDF document text
    • https://niraniki.weebly.com/uploads/1/3/4/6/134662237/1e5ac419.pdfIn PDF document text
    • https://teraxamexad.weebly.com/uploads/1/3/1/3/131380600/dujuve-dadegujonozavew-mizofelirujozu.pdfIn PDF document text
    • https://titanukudolilip.weebly.com/uploads/1/3/6/0/136082060/rositipumiwewasekul.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500897/normal_5fdd17e2d7514.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xotepugiz.rf.gd/20762309673.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_off0000d1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B2 5572 bytes
SHA-256: 44b2183e716c34d67f32f28f3ebb8d0a4417459182eaddeebe4d3aa5ac89394a
font_01_sfnt_off0000e4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A1 10144 bytes
SHA-256: 616d7b634f909b04ad83e405c1acfa28ba77b21084b0ecc09d433919f5e23bd9

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