Malicious PDF — malware analysis report

Static analysis result for SHA-256 4531a708e4459756…

MALICIOUS

PDF

75.0 KB Created: 2021-01-16 15:45:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ef7125a18380842f9dd6a2a2838d228 SHA-1: b95edad207c11c1a1ef081f2b6fe98e756626e3a SHA-256: 4531a708e44597561dec3d8ba1ee3054674c0aa3206d4c910af23f0a7384f6c2
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document contains numerous embedded URLs, suggesting a phishing or scam attempt by directing users to potentially harmful websites.

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ggtraff.ru/aws?utm_term=drakor+romance+is+bonus+book+drakorindo
    • https://nukawidizuzaxep.weebly.com/uploads/1/3/3/9/133997642/6297281.pdf
    • https://site-1225904.mozfiles.com/files/1225904/64913218973.pdf
    • https://site-1166068.mozfiles.com/files/1166068/yealink_t23g_manual_espaol.pdf
    • https://cdn-cms.f-static.net/uploads/4485010/normal_5fa770dca1846.pdf
    • https://cdn.sqhk.co/pamezuravuno/00ijijb/superheroes_coloring_book.pdf
    • https://cdn-cms.f-static.net/uploads/4456140/normal_5fa35f8b485b0.pdf
    • https://nisofopirumo.weebly.com/uploads/1/3/4/4/134478351/liwutizogufus-jodupisazijewi-finuwupu.pdf
    • https://site-1211548.mozfiles.com/files/1211548/kufuvozipinujajanasere.pdf
    • https://site-1174172.mozfiles.com/files/1174172/red_ball_1_volume_1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/ganubifirigevi/57279185574.pdf
    • https://s3.amazonaws.com/tidigudetefumof/mufifesop.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_off0000dbd2.bin
53321779743e4f63a822e1fdbfc303b9c189431a7c69a6448c2fa9dfb816ef36		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD2 3012 bytes
font_01_sfnt_off0000e698.bin
ec84702cfb7de5a5d0e380bce221b2108a73ef16935fcb3a578642516df51704		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE698 5256 bytes
font_02_sfnt_off0000f865.bin
873d4b0f5b6cdbc31f5f25e4869641d76f376bd2ba5b193002647fe2a1b0ad87		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF865 10844 bytes

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