Malicious PDF — malware analysis report

Static analysis result for SHA-256 996c3c026525d618…

MALICIOUS

PDF

85.6 KB Created: 2021-05-28 15:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 79a178441e6d496e1c779c64ec0c2d40 SHA-1: b3a56660be55e06d8c908f3a349f618bc968f725 SHA-256: 996c3c026525d618f1bb6d0ab80ee6d055365b7b986bdf1f58ef61fd67b402b6
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains keywords related to 'keto cleanse pills' and references to the wkhtmltopdf tool, indicating a lure to a potentially malicious website. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://fokemale.ru/strik?utm_term=do+keto+cleanse+pills+work PDF link annotation
    • https://dolilufaxeni.weebly.com/uploads/1/3/2/6/132683246/2556550.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393637/normal_605504fd2bfb2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385847/normal_5fece8609b721.pdfIn PDF document text
    • https://leputixoted.weebly.com/uploads/1/3/2/6/132683438/1857458.pdfIn PDF document text
    • https://wugisawenepo.weebly.com/uploads/1/3/4/7/134749509/sosura-wawiza-vesil-vudum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465924/normal_604ebf07c768e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502920/normal_5fe259d8e87ef.pdfIn PDF document text
    • https://xirabefutabo.weebly.com/uploads/1/3/5/3/135323672/xulusidewaruta-waximovabom-wetatexewex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462678/normal_606990b2148eb.pdfIn PDF document text
    • https://fofapabijutoza.weebly.com/uploads/1/3/4/7/134713913/3370032.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380413/normal_5ff62232caded.pdfIn PDF document text
    • https://wobofosowipifir.weebly.com/uploads/1/3/0/7/130776138/vuxugi.pdfIn PDF document text
    • https://jogelobob.weebly.com/uploads/1/3/5/9/135961552/xabubozugibodideboku.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/57e284fd-59e6-44f2-a209-f973d0db7801/to_my_dear_and_loving_husband_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81d8f020-1439-4f9c-bdea-34062e3bf173/what_nail_shop_close_at_8.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f3c99ac-98cc-4c44-abaf-3cc52352645a/bedava_arabesk_damar_arklar_dinle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbac03c4-f89a-4297-8ceb-a011ac28a7ec/481944925.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e99db006-3bce-4de7-b32c-598c8dc80a3e/61892506558.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a84ccaec-8ce0-440d-b75e-7bf2071d8d0c/83817852368.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7ecb194-4278-4437-b88e-f921e55f7979/lixikejelewiv.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_off000112ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FF 5084 bytes
SHA-256: ac78553834e872c837591ed88fad83493dfb7fa29543cc862616b2f913142f6c
font_01_sfnt_off00012476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12476 10772 bytes
SHA-256: 54016686f62788dca6c207ee2df2b5f5f4a4d70a02cb31ecb24aa514371a37fd