Malicious PDF — malware analysis report

Static analysis result for SHA-256 53f2bbf4e1e71b0b…

MALICIOUS

PDF

73.5 KB Created: 2020-12-28 20:07:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 58b76587bcb3d8e3927421f79110bb06 SHA-1: 150a667d9b336055155cb1e1775d6cadec233f91 SHA-256: 53f2bbf4e1e71b0b26d196303e034aea467d9b22d1cdb85b60db6133fbc3fc4d
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting services and known malicious redirectors. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary function appears to be acting as a link farm to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://cctraff.ru/123?utm_term=sex+gender+biology+in+a+social+world+pdf
    • https://nubokulusavabum.weebly.com/uploads/1/3/4/7/134702007/886123460b.pdf
    • https://static.s123-cdn-static.com/uploads/4488316/normal_5fcaa41c1f5e5.pdf
    • https://luzofimufabo.weebly.com/uploads/1/3/4/5/134590143/5e32a22dd3.pdf
    • https://webapifupa.weebly.com/uploads/1/3/4/7/134706955/xuxinokawazom.pdf
    • https://jarapitoxedomel.weebly.com/uploads/1/3/1/4/131437170/mawipubowibetin_pelesibatomo.pdf
    • https://fataleripe.weebly.com/uploads/1/3/0/9/130969718/840826.pdf
    • https://zepixufiguw.weebly.com/uploads/1/3/4/1/134108583/2908604.pdf
    • https://sopidafepu.weebly.com/uploads/1/3/4/7/134744384/4965839.pdf
    • https://gotugutulado.weebly.com/uploads/1/3/4/6/134648793/580270.pdf
    • https://kunewosixur.weebly.com/uploads/1/3/4/3/134393142/29900cf0accf6.pdf
    • https://jijalasigode.weebly.com/uploads/1/3/4/3/134344414/6306769.pdf
    • https://wawupibinotab.weebly.com/uploads/1/3/4/9/134900246/7585125.pdf
    • https://xotozefubineru.weebly.com/uploads/1/3/4/5/134576546/tefekoba-wemojinom-vozavabegegafaf-nomegumozejo.pdf
    • https://cdn-cms.f-static.net/uploads/4390661/normal_5f920e39c230f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/loneminovu/goal_setting_worksheet_tools.pdf
    • https://s3.amazonaws.com/daraniwekamidir/83886283918.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_off0000de14.bin
535511fc1acc9d9f6cc87acd4d8028d8e86df4837bb5515c894e49bb4fecac82		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE14 5828 bytes
font_01_sfnt_off0000f217.bin
a99eee278ee6fcab2e43c5c6ae3733bb31ebd26fd0e9f3ce4a9d6b29ac176840		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF217 11640 bytes

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