Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab3ea0416eb1d258…

MALICIOUS

PDF

68.6 KB Created: 2020-11-19 07:29:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d268fe00913d212f8b99725ef1fef584 SHA-1: 12ff4dd83517d1071d10fc74caabce7d12dc3b0c SHA-256: ab3ea0416eb1d258e39c49df79dab8e95de48e5a961e016628e08f6e0ce89a39
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a known malicious redirector. The heuristic firings indicate a link farm designed to distribute content, and the ML classifier strongly suggests malicious intent. While no scripts were explicitly extracted, the nature of the embedded links points towards a phishing or malware distribution scheme.

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-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://gettraff.ru/123?utm_term=far+eastern+university+russia
    • https://luriwopowilexat.weebly.com/uploads/1/3/4/3/134338936/a43cc7d8ecf85b9.pdf
    • https://wifonofiwi.weebly.com/uploads/1/3/4/6/134636358/dolata.pdf
    • https://cdn-cms.f-static.net/uploads/4375518/normal_5f987d4752f72.pdf
    • https://rabugotekinevod.weebly.com/uploads/1/3/1/8/131871666/felixemizu.pdf
    • https://cdn-cms.f-static.net/uploads/4418968/normal_5fa0cc962e58e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xanebavifamopez/55307086319.pdf
    • https://s3.amazonaws.com/zuxime/calicut_university_bsc_physics_syllabus.pdf
    • https://s3.amazonaws.com/gifiz/kojavuninowiwotikapi.pdf
    • https://s3.amazonaws.com/kakekojezutok/phi_chi_medical_fraternity_omaha_unmc.pdf
    • https://uploads.strikinglycdn.com/files/f4dc57b9-bd8c-4386-8ede-4d203a8f1a8a/boluvix.pdf
    • https://s3.amazonaws.com/wekibik/zopavimilikibolokuwu.pdf
    • https://s3.amazonaws.com/fapaga/watch_dragon_ball_battle_of_the_gods_online.pdf
    • https://s3.amazonaws.com/norozovijalu/his_excellency_george_washington.pdf
    • https://s3.amazonaws.com/saziwijaxodav/picture_background_editing_software_free.pdf
    • https://s3.amazonaws.com/babuxufarizuxur/86276087481.pdf
    • https://uploads.strikinglycdn.com/files/1605cde0-e085-44c9-b737-843f091c6164/rawinuxi.pdf
    • https://s3.amazonaws.com/pazifetanegapu/ielts_reading_passage_3.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d111.bin
42cc3dbecabe43343b8e24c7e9c6780b37ba423b79713bd90c5a97880f8056f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD111 4764 bytes
font_01_sfnt_off0000e162.bin
54102859906a095fd1dce502e9bb20980dccc96b3437c8a7b657af304abed4b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE162 10420 bytes

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