Malicious PDF — malware analysis report

Static analysis result for SHA-256 13115394dc74b2f3…

MALICIOUS

PDF

90.8 KB Created: 2021-06-11 20:13:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: c9139ab16c08a01d2f446e7357cd6e87 SHA-1: cf5393b3b517cdbef74fdafe98fc8f2b1f51b78b SHA-256: 13115394dc74b2f3eccd2c4b607b37f42ce90268580aefca16d574db9de8ad69
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to disposable hosting or redirectors, indicating a phishing or link farm attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://xezojetit.ru/123?utm_term=majesty+2+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403540/normal_6017b275b15ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365652/normal_5fd137e8337e5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472774/normal_5fcc5d94ec53d.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4482629/normal_60b5ad79be39c.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4459325/normal_60b54b3aba31d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382190/normal_6008ac1d37336.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460266/normal_6069fedebd1fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416656/normal_604ccc11be238.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502245/normal_6066d8966eb79.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lugozamuxika.pbworks.com/w/file/fetch/144883683/aka_aka_ya.pdfIn PDF document text
    • http://pejokawigar.pbworks.com/f/what_is_the_symbolism_in_hills_like_white_elephants.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/735f2f10-3451-407a-804d-1ce699d45bbc/88350021840.pdfIn PDF document text
    • http://jobojifitin.pbworks.com/f/how_to_clear_filter_in_google_sheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/035eece6-f565-427c-9907-fe6a5e840da9/bronica_etrsi_manual_download.pdfIn PDF document text
    • http://gamanovu.pbworks.com/f/balon_bolsa_educacion_fisica.pdfIn PDF document text
    • http://nunaruribeg.pbworks.com/f/33039224375.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae22eb0d-c803-4953-b9ef-6a097659228b/giwewozorilisunadezivapum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d633ad02-af29-4f92-8297-dcfea374425b/anatomy_and_physiology_1_final_exam_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a0a306f-7679-46e8-8a3e-5429c9108ed9/favid.pdfIn PDF document text
    • http://nosiravuga.pbworks.com/f/cognitive_behavioral_therapy_for_ocd.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_off00012668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12668 5180 bytes
SHA-256: f9b7fa6dbc2a3b4bf9e0ff2aa5b88f20e118dbd164d94256ebec4082a6dc701b
font_01_sfnt_off00013839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13839 10624 bytes
SHA-256: 905af7309cacd4c016fdaa86f4f574f6f84cc1dcdfdd12c0a8bfd06036b84ecb

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