Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7a1dd73bed802ad…

MALICIOUS

PDF

69.0 KB Created: 2020-11-12 14:24:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6b844451e893ddd5c95b71500fc5522 SHA-1: d4ced25ed3b3909eb21e5eb76063231f86c410e2 SHA-256: f7a1dd73bed802ad7eaf07cb1ba36d321114e3cf04371a3309064d8da3aa1f5d
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. The ML classifier and ClamAV also flagged this file as malicious, indicating a high likelihood of phishing or malware distribution. The presence of embedded URLs suggests an attempt to lure the user to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=reference+manual+on+scientific+evidence
    • https://vixeroniwemeful.weebly.com/uploads/1/3/0/7/130740086/7891164.pdf
    • https://cdn-cms.f-static.net/uploads/4425926/normal_5fa4262916a68.pdf
    • https://cdn-cms.f-static.net/uploads/4418199/normal_5f97381f467a2.pdf
    • https://kesafoxubifode.weebly.com/uploads/1/3/4/4/134481064/darateberunudaduwaza.pdf
    • https://sizukejagu.weebly.com/uploads/1/3/2/6/132681884/9081031.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xeroguru/samsung_phones_comparison_2020.pdf
    • https://s3.amazonaws.com/jezaxojipevu/lost_spires_oblivion.pdf
    • https://s3.amazonaws.com/genedesowul/70269156128.pdf
    • https://s3.amazonaws.com/zidosozawok/red_dead_redemption_undead_nightmare_trophy_guide.pdf
    • https://s3.amazonaws.com/rilexazejuzovep/national_guidelines_for_palliative_care_singapore.pdf
    • https://s3.amazonaws.com/panalipolifod/tyt_md-380_review.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5a5.bin
a8ea730eae23055bfc7fa8c197448834dc3f9c434ec9abbb736a6ab8b67ed357
pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A5 5232 bytes
font_01_sfnt_off0000d760.bin
6539b129c5cd894636dc8f40f53a156c00c8f46378ab4f137c96d687a1cff6ed
pdf-font-stream PDF embedded font (sfnt) at offset 0xD760 3720 bytes
font_02_sfnt_off0000e2c3.bin
f1bc7268b312595b774a506f7f5796222a056f0f12e7182ee1ced2f2791ef30f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C3 10924 bytes