Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4af85e740a28562…

MALICIOUS

PDF

71.1 KB Created: 2020-12-27 07:35:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: dba79e24f52b60a21fa0029507960198 SHA-1: b313c2c31d53816c96e3672f6b91bf2d3b86353f SHA-256: c4af85e740a285623f29c33eddc72860806e2716ed3cadd416b6f5f0956a7f0b
214 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The document body is heavily obfuscated, but the presence of numerous external links suggests an attempt to direct users to malicious websites for phishing or malware distribution.

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://traffmen.ru/aws?utm_term=bikroy+mod+apk In PDF document text
    • https://cdn.sqhk.co/xevuvuxene/Nichagd/87420601335.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450639/normal_5f9ec04db918d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458631/normal_5fbac3b72e144.pdfIn PDF document text
    • https://cdn.sqhk.co/jafetegupam/k8jeiiw/danetijipogiwukanajav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443344/normal_5f9c7f95ce7a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393022/normal_5f989c17a8382.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418796/normal_5fe7e9111e33c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401723/normal_5fc592dd1e54b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404488/normal_5fd9444832508.pdfIn PDF document text
    • https://rorupuloloxotog.weebly.com/uploads/1/3/1/4/131409755/jipujim.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/tedowafomaru/event_backdrop_design_templates_free.pdfIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/brilliant_lighting_sensor_manual.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B9 5108 bytes
SHA-256: 01b29430452e325d07ac5abf5d972af9245629ab2d14b507ad4f840da5bf7da6
font_01_sfnt_off0000d411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD411 10948 bytes
SHA-256: 01e2cb51eeaa563144f42976c35ba767691f4579640d8e1755aff25d35a9fef3
font_02_sfnt_off0000f989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF989 16168 bytes
SHA-256: 794d8cc090a449e0d460036171b2d5b2c749cb0dc3f17972c44626ada68ee3d8

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