Malicious PDF — malware analysis report

Static analysis result for SHA-256 a98cbcb05b5f5958…

MALICIOUS

PDF

59.1 KB Created: 2020-11-23 17:36:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 332c7af81970b877f4efc17603231b86 SHA-1: d0eb85bbf64f523a0d730798e82564f89b20f300 SHA-256: a98cbcb05b5f5958824ad85c8e08f67da722bf15aea341674c0c575f6e6fdf85
214 Risk Score

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 known malicious redirector. This suggests the document is designed to direct users to malicious websites, potentially for phishing or to host further malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=advanced+strength+and+applied+stress+analysis+pdf
    • https://bonopabugo.weebly.com/uploads/1/3/4/5/134581776/90c8f14.pdf
    • https://niginijepajenok.weebly.com/uploads/1/3/4/5/134505752/zowanowepemerij-weresawoti-bitoxawibob-zovadevodebipef.pdf
    • https://judezirebesos.weebly.com/uploads/1/3/4/6/134669344/75a1fd60ac636f8.pdf
    • https://cdn-cms.f-static.net/uploads/4393359/normal_5fa2203718bbe.pdf
    • https://furureseseruwa.weebly.com/uploads/1/3/4/4/134481841/kurosafo.pdf
    • https://xuguzopagar.weebly.com/uploads/1/3/4/4/134490213/9963781228.pdf
    • https://fenagedel.weebly.com/uploads/1/3/4/3/134316540/pasuxa-busugukakabosef-tofotaduxiweku.pdf
    • https://nupejaxisolerez.weebly.com/uploads/1/3/4/3/134348845/6720997.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dazuxujepov/66413675911.pdf
    • https://s3.amazonaws.com/mijedusovineti/sobadawonesunakitiku.pdf
    • https://s3.amazonaws.com/kudefem/endodontic_surgery.pdf
    • https://s3.amazonaws.com/wikurixobelu/bitdefender_antivirus_android_cracked.pdf
    • https://s3.amazonaws.com/foneniz/kukubod.pdf
    • https://uploads.strikinglycdn.com/files/4b072bc0-5ab4-4858-be53-8a8f22885e3f/pocahontas_area_school_iowa_website.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ac31.bin
a62811be7d10b119236598f38020e62903783037d0820ae50e4e0edaf602c4e0
pdf-font-stream PDF embedded font (sfnt) at offset 0xAC31 5568 bytes
font_01_sfnt_off0000bf2f.bin
64720945154f98fb61c117a9f50ac7a82fecca53a9b8a33929182ffe56161386
pdf-font-stream PDF embedded font (sfnt) at offset 0xBF2F 9420 bytes