Malicious PDF — malware analysis report

Static analysis result for SHA-256 fec0f88d91261fc2…

MALICIOUS

PDF

68.8 KB Created: 2020-11-13 22:40:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 4d402ed0ba4328c0584e6905056ee8aa SHA-1: 5bf4dae38223791512008925bfb3063bf01a25ca SHA-256: fec0f88d91261fc20cd2025b942b0ec4ba408a9d3b3b91a558697e154debec8e
262 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript T1553.005 Security Software Installation

This PDF file is identified as malicious by multiple heuristics and ClamAV, indicating it's a phishing or trojan delivery mechanism. It contains a critical link to a known malicious redirector, disguised as a download for 'Fallout new vegas cracked dlc'. The document also contains a high-risk heuristic for disabling security software, suggesting an attempt to bypass defenses. The presence of embedded URLs and the ML classifier output strongly support a malicious intent, likely to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9882

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.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://cctraff.ru/strik?utm_term=fallout+new+vegas+cracked+dlc+downlo In PDF document text
    • https://cdn-cms.f-static.net/uploads/4377662/normal_5f8ecf93d3329.pdfIn PDF document text
    • https://vuderuxedus.weebly.com/uploads/1/3/4/6/134692959/452650fd723.pdfIn PDF document text
    • https://xisubuto.weebly.com/uploads/1/3/1/3/131380177/8457194.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/bulalowisu/example_of_affidavit_of_support_letter.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/bd_chaurasia_general_anatomy_book.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/jefonijume.pdfIn PDF document text
    • https://s3.amazonaws.com/gajejasa/mexican_fast_food_chains_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/xulakivumaguleremelepobew.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3B8 5112 bytes
SHA-256: 848cf027ab6a94b715b980072575d65811cefe811917c73f78ba11ef59ed2653
font_01_sfnt_off0000d549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD549 10268 bytes
SHA-256: 8be0f617c75121609369b3616da230fbe4df204cc57a821a94eb8cd3c97fda10
font_02_sfnt_off0000f8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A5 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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