Malicious PDF — malware analysis report

Static analysis result for SHA-256 167363e5834d64b3…

MALICIOUS

PDF

62.0 KB Created: 2021-01-09 05:40:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 3bba66e9d6fee7061852c0fe6067a89a SHA-1: b3034e6e06a37ad6c707a01ce2b4fdf1d40c90e8 SHA-256: 167363e5834d64b3e469f0cf730047dbbc3aa42eb36eaec719761ca9f372551f
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The heuristic firings indicate this PDF is designed to link to external resources, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffmen.ru/123?utm_term=rc66x+remote+manual In PDF document text
    • https://static.s123-cdn-static.com/uploads/4393488/normal_5ff5a2cacd087.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449629/normal_5fef3a0e147de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365552/normal_5f98559d0d76f.pdfIn PDF document text
    • https://cdn.sqhk.co/pubodegosog/8ohjheX/masem.pdfIn PDF document text
    • https://dinoromakutaxe.weebly.com/uploads/1/3/4/4/134479472/vovidonerus-pedoriroxeve-pamirelaxugo-rifumasifo.pdfIn PDF document text
    • https://cdn.sqhk.co/raxoxawupej/QAzgfia/rally_racing_nintendo_switch.pdfIn PDF document text
    • https://cdn.sqhk.co/bovokolel/ia8Pegj/zombie_frontier_3_hack_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369654/normal_5f8ba742ef894.pdfIn PDF document text
    • https://lufisadoxusixa.weebly.com/uploads/1/3/4/5/134583632/silojo-venetepise.pdfIn PDF document text
    • https://kuburabet.weebly.com/uploads/1/3/4/3/134362545/2f4e4826a3b4050.pdfIn PDF document text
    • https://cdn.sqhk.co/gefisodir/TYTjfig/sujubefojunajolavinesized.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376105/normal_5fcca79f1f590.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e16b373-a400-4e08-b9c7-a308225a5dcf/wadorofifirele.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_off0000b65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB65B 4996 bytes
SHA-256: 4af562818d3b837ee1ea22974bdc5adb396da37abfae992675f6cda1de292e04
font_01_sfnt_off0000c74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC74A 10120 bytes
SHA-256: 34e4167b76c010bca858ea0dcf055010c9c81687f678f58a474445f96a6a4319

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