Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdf775ae3fe81c02…

MALICIOUS

PDF

77.5 KB Created: 2020-12-31 17:40:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 2dd092ba20279af67caa3d0c318bce36 SHA-1: b9fe461f5c8181c01ce92591f53a65f5fb4cd6ea SHA-256: fdf775ae3fe81c02396b10e0ba1a1e4688863e95b088e8b0250946e6be13f67b
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with critical heuristics identifying it as a malicious redirector and a link farm. The ML classifier and ClamAV also flagged it as malicious. The presence of embedded URLs suggests an attempt to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gettraff.ru/123?utm_term=dnd+5e+sling+ammunition In PDF document text
    • https://cdn.sqhk.co/bugolajoxodu/ih7hg7u/dragon_ball_stickman_fight_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/fopujetoros/6hchdjg/51425746893.pdfIn PDF document text
    • https://kedifekutijita.weebly.com/uploads/1/3/4/7/134713117/b7399c5092bc.pdfIn PDF document text
    • https://fufukarebalomok.weebly.com/uploads/1/3/4/3/134352968/5b16bec0b8fa23.pdfIn PDF document text
    • https://cdn.sqhk.co/xotabuti/xgcKlgc/20265053078.pdfIn PDF document text
    • https://cdn.sqhk.co/fedovusig/h39iagc/15235352433.pdfIn PDF document text
    • https://nifevokore.weebly.com/uploads/1/3/1/4/131437532/6459539.pdfIn PDF document text
    • https://cdn.sqhk.co/bebetirifam/BGh1haH/spongebob_moves_in_mod_apk_v1._0.pdfIn PDF document text
    • https://lamuwibosuzo.weebly.com/uploads/1/3/1/0/131071033/2487519.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/pokixovuxik/endorsement_form_takaful_malaysia.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/zujorilukorakasupoje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfad6eea-653c-4dbe-b796-79cb60b1a9f7/bowling_king_cheats_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8e77f54-286d-47ba-a329-f133d37e081e/elite_dangerous_eddi_scripts.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_off0000ea29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA29 5172 bytes
SHA-256: 95e4f620a6c6ba315a86e2b1a286a08f77d026a2240b99d4c820e7d41af6babd
font_01_sfnt_off0000fba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA8 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off00010436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10436 10728 bytes
SHA-256: ecaa55e2e4f040489764071ee73658b490e6b07bc4a7db3e9e05bddfcbd4312d

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