Malicious PDF — malware analysis report

Static analysis result for SHA-256 998d46322a0cf8cc…

MALICIOUS

PDF

61.3 KB Created: 2020-11-24 04:45:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 07336666bf2f701835a2494f02a4030a SHA-1: 276c1f9a29c252987997b0812ae2669ab5a777b8 SHA-256: 998d46322a0cf8cc7bbcf8d81a63f795f658d60b2b50df236bea5e68436764fe
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a ClickFix paste-and-run lure. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://cctraff.ru/strik?utm_term=battlefront+2+black+screen+windows+1 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4393489/normal_5f98fb36cf608.pdfIn PDF document text
    • https://bofazereb.weebly.com/uploads/1/3/4/6/134675062/2595a9594ec5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366358/normal_5f9d2787aa1b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497369/normal_5fb27d7eebf3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422906/normal_5f9de2036a95d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386336/normal_5f9e956f30226.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471273/normal_5fa537c2f0c31.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/what_is_the_coldest_city_ever.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/guxawovoxa.pdfIn PDF document text
    • https://s3.amazonaws.com/regegozumekoza/71864076025.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/bernard_cornwell_agincourt.pdfIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/building_information_modeling.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_off0000b346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB346 5544 bytes
SHA-256: 6b34f776add5ca279597a926e2475c1639d8f73c6d0cfd3043ef1b9db53f371a
font_01_sfnt_off0000c64b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC64B 10004 bytes
SHA-256: 751578f38015d651b88976392bdddcab89c343c9ec279ae1c11b3249d291c0c5

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