Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a193f23ac7fe68e…

MALICIOUS

PDF

82.1 KB Created: 2021-01-03 23:48:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 512e0250411924a72e2267c6190af213 SHA-1: ecdede006fd689fafcdea96d52ca7e7d09a8e7a1 SHA-256: 5a193f23ac7fe68e97d0816a904da5d687ccbc320b12d215b339e718c7a49d78
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to known malicious redirectors and disposable hosting services. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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/123?utm_term=tobias+funke+albino+black+man In PDF document text
    • https://dezuvatag.weebly.com/uploads/1/3/4/6/134667454/52def.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxisilogok/bpigjbW/bowling_alleys_in_western_mass.pdfIn PDF document text
    • https://cdn.sqhk.co/kevejonob/gigdMih/swamp_thing_comic.pdfIn PDF document text
    • https://cdn.sqhk.co/sisadenev/VsT4dPk/necromancer_druid_5e_build.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378170/normal_5fb47c9d14718.pdfIn PDF document text
    • https://lisefemibumosu.weebly.com/uploads/1/3/4/3/134339955/8659590.pdfIn PDF document text
    • https://fuwelobuzade.weebly.com/uploads/1/3/4/6/134649994/663dfdd.pdfIn PDF document text
    • https://cdn.sqhk.co/sikibeve/idSjaic/star_wars_the_old_republic_android_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/lojavowi/Mzniagj/74400237581.pdfIn PDF document text
    • https://gatokoliza.weebly.com/uploads/1/3/0/7/130739470/jebulevovusil.pdfIn PDF document text
    • https://bomoturu.weebly.com/uploads/1/3/1/3/131384468/9631373.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/27c256a4-8476-44f0-8998-1d61f19f86fd/4203693105.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e204ac90-1d6e-43b1-b9b8-99f268786195/89665623434.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_off000102d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D7 5084 bytes
SHA-256: 127094b21afcfe5b3f56c32a3b43f1aa1281d28f9ef17d24c57dc65974599e98
font_01_sfnt_off00011420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11420 11780 bytes
SHA-256: 6da2c8e1709a79276c5c348b5743408f41f72036933ad559c01db610848e152c

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