Malicious PDF — malware analysis report

Static analysis result for SHA-256 813bf75f07586130…

MALICIOUS

PDF

68.9 KB Created: 2020-12-02 09:14:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b77009ebcc08388c5d461164a87e1221 SHA-1: d217a14bf953a7d3f46826f1802e018232976a07 SHA-256: 813bf75f07586130a64f856fc6a9d0a557c6158836470f00b885df0c96241691
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 at least one pointing to known malicious redirector infrastructure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or SEO abuse. No scripts were extracted, but the presence of numerous external links suggests an attempt to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cctraff.ru/strik?utm_term=minecon+2012+cape+price
    • https://cdn-cms.f-static.net/uploads/4408588/normal_5f9e68fcb13a0.pdf
    • https://cdn-cms.f-static.net/uploads/4447265/normal_5f9dcab18d429.pdf
    • https://devudupaf.weebly.com/uploads/1/3/4/8/134880603/kutunoxabulufiz.pdf
    • https://vifedunujaxali.weebly.com/uploads/1/3/4/3/134398483/2373021.pdf
    • https://tozowibalap.weebly.com/uploads/1/3/4/3/134383498/fawawera.pdf
    • https://reninifovebomul.weebly.com/uploads/1/3/4/3/134361606/wuwed_gekovanokariw_wuvekozinube_mudaru.pdf
    • https://merokiniperoj.weebly.com/uploads/1/3/4/6/134691049/vegelaxuxub.pdf
    • https://cdn-cms.f-static.net/uploads/4379371/normal_5f97d1a86b970.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/3936e3fd-7648-4670-bc55-55267c9605bb/birugojuz.pdf
    • https://s3.amazonaws.com/rufonali/67352650865.pdf
    • https://s3.amazonaws.com/widuxade/84133766931.pdf
    • https://uploads.strikinglycdn.com/files/2b64a495-e4fe-4f5c-a051-5b9bfd366d93/nimupodiwu.pdf
    • https://s3.amazonaws.com/wupixufekijax/jatuwozexelofexif.pdf
    • https://s3.amazonaws.com/pusori/app_hack_clash_of_clans_android_2015.pdf
    • https://s3.amazonaws.com/visagogijulep/27415076588.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2e4.bin
761af1b61e36cbb0edbb839369986447fcdb9cc7ea6db079da425cb67d3f3b89		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E4 4756 bytes
font_01_sfnt_off0000d309.bin
a9bc636c08c087817e029649a34f715aeec82ee2afb3d82d35b80e13f4d35f2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD309 11092 bytes
font_02_sfnt_off0000f8e4.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E4 4324 bytes

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