Malicious PDF — malware analysis report

Static analysis result for SHA-256 52624d187d90c79c…

MALICIOUS

PDF

84.3 KB Created: 2021-01-08 04:58:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 45c4f41295a83ccaa9cdc643043c197c SHA-1: 797516834b279ebd4c4284e3d8d7cf57b9a7e45c SHA-256: 52624d187d90c79c471c03483313de7d29d4054afe572b100e31526a2774122a
186 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics as a link farm, containing a significant number of external URLs pointing to potentially malicious content. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the structure and numerous external links suggest an attempt to lure users to compromised or malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffset.ru/123?utm_term=kawhi+leonard+king+of+the+north+billboard PDF link annotation
    • https://bofujobepoj.weebly.com/uploads/1/3/1/1/131164048/7681194.pdfIn PDF document text
    • https://fapovodulutob.weebly.com/uploads/1/3/4/3/134361236/visawanesufud-modesijinagil-buvawes-pajopok.pdfIn PDF document text
    • https://xisosisudotaju.weebly.com/uploads/1/3/0/7/130738948/fanefuwevuki_regebugabufu_gepiz.pdfIn PDF document text
    • https://rimenedefogifu.weebly.com/uploads/1/3/4/4/134466040/niwunanixome_supip_parazevajun_bosivarurur.pdfIn PDF document text
    • https://rolorizumi.weebly.com/uploads/1/3/4/3/134316308/3ddcf7e5b27b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481820/normal_5ff251e03da16.pdfIn PDF document text
    • https://cdn.sqhk.co/xomifinetepi/h8VUhdl/53182782290.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/xefejevife/mewiwigemibigiwutuzije.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/juwolafuxekupuv.pdfIn PDF document text
    • https://s3.amazonaws.com/lanowilovuviwib/16107118741.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_off00010b4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4B 5256 bytes
SHA-256: 9a07e888b0adea7e55dd43db6cb5ccf0513a32cca5723de22c91a92cce4d0766
font_01_sfnt_off00011d3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3A 11632 bytes
SHA-256: cc69cca772a24ddb1a728fedb0ca57daa6348603c400cc8911811cb6013ef67b

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