Malicious PDF — malware analysis report

Static analysis result for SHA-256 df407e13679579f9…

MALICIOUS

PDF

76.3 KB Created: 2020-12-26 18:42:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 3d5aa52754f7768fc81e60ffb6aad013 SHA-1: eb8fd41f4694dc5203871dd9292d5a2816387396 SHA-256: df407e13679579f972123d8e674b5eb32a8e704ced71c68211d29ac69ee1d169
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with critical heuristics indicating it links to known malicious redirector infrastructure and a PDF link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were extracted, the presence of numerous suspicious URLs points to a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffking.ru/123?utm_term=harley+quinn+images+free+download In PDF document text
    • https://cdn.sqhk.co/zafupusapun/hjiiihj/zakerofofamafusoruk.pdfIn PDF document text
    • https://cdn.sqhk.co/wekonexiw/5EVnhd4/served_up_sober.pdfIn PDF document text
    • https://topemarepebide.weebly.com/uploads/1/3/4/3/134316461/senegawuk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421464/normal_5fe362e5657ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385235/normal_5fb003005f470.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/bupesejirijejus/15749187719.pdfIn PDF document text
    • https://s3.amazonaws.com/xutomoxu/xileluberameja.pdfIn PDF document text
    • https://s3.amazonaws.com/bagisi/35411739720.pdfIn PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/the_glades_season_5_episode_1.pdfIn PDF document text
    • https://s3.amazonaws.com/fakuguvil/spectrum_math_grade_8_answer_key_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/42951292681.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE402 5508 bytes
SHA-256: 9d9996074ce41351d5ed0b907b0102833f9a89f95878bbc9d944be25f3d67124
font_01_sfnt_off0000f6b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B9 15468 bytes
SHA-256: da56a6201036ecaa01e4b0425efc769adb39142898d9b41c7530a5351c4014d9

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