Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0a4e8399563d4b0…

MALICIOUS

PDF

62.1 KB Created: 2020-12-21 05:02:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 37148a2807228201bc6bc59347434503 SHA-1: 35202566b80f579ab7da5979184490569f0f6165 SHA-256: f0a4e8399563d4b04bb1bf23f2fa6c690649b8000b4a5deb8003aa0dbac584c0
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV also flagged this file as malicious. The presence of numerous external PDF links suggests a link farm or redirection scheme designed to lead users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • 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://ggtraff.ru/aws?utm_term=bela+bela+song++2018 In PDF document text
    • https://derebadinexito.weebly.com/uploads/1/3/4/0/134012579/pibiperij.pdfIn PDF document text
    • https://rimesozarabef.weebly.com/uploads/1/3/1/6/131607712/wuloxogujot.pdfIn PDF document text
    • https://wexemexaxixu.weebly.com/uploads/1/3/4/7/134709907/4163356.pdfIn PDF document text
    • https://gekubunog.weebly.com/uploads/1/3/4/2/134235395/xokupijuxove_desipeva_dituludifujamu_mukev.pdfIn PDF document text
    • https://feziriwavejoli.weebly.com/uploads/1/3/4/0/134096108/dujowimakuverixomolo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd030ccc750a3b5a07033a/1606222606475/vexubep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c96339e9-b01b-4712-be9b-b40c0efafd41/sorel_caribou_boots_nz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b949c51d-2c24-41f9-ab77-fa037360a924/watch_wolf_of_wall_street_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69eee5dc-03e1-4c31-be68-9bae45ff88e6/13884054449.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6759a89c-3070-4571-9da5-6b69bc73b1fb/69509617207.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_off0000b22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB22D 5464 bytes
SHA-256: 37a48357d517a0b3541755e6d348fd7123351b908f0d8ed2096f73ab4c0aeed4
font_01_sfnt_off0000c4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D8 11896 bytes
SHA-256: 091c962a4ba7631df1ebe369e574d1447a4944a0cd7c01df3b50e88ac736c905

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