Malicious PDF — malware analysis report

Static analysis result for SHA-256 de2c0551b3d23b94…

MALICIOUS

PDF

60.8 KB Created: 2020-11-13 19:25:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: b789887f52e5adbfcf724fd0fcb39671 SHA-1: bff09ea8dee53738d8aa86f7b3401bbc261cc3c0 SHA-256: de2c0551b3d23b942540a24ff4ecd1450c81e3b77ddb6d2ba8bb4b8b36fc2d6d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. The presence of external URIs and a link farm heuristic points towards a strategy of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffking.ru/strik?utm_term=pampered+chef+casserole+dish PDF link annotation
    • https://jiwepurojal.weebly.com/uploads/1/3/0/7/130775762/3582991.pdfIn PDF document text
    • https://fizolapojola.weebly.com/uploads/1/3/1/3/131383549/0054416.pdfIn PDF document text
    • https://lizotolagodega.weebly.com/uploads/1/3/4/4/134495854/93e6db048105412.pdfIn PDF document text
    • https://disadoxamegipu.weebly.com/uploads/1/3/4/5/134527150/2606708.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367645/normal_5f8762322584b.pdfIn PDF document text
    • https://gejatovuri.weebly.com/uploads/1/3/1/4/131406669/mibuwazugaxiwom-zapupawuve-fonusixodo.pdfIn PDF document text
    • https://dopuxaponaxu.weebly.com/uploads/1/3/2/6/132695391/98f03b2a8.pdfIn PDF document text
    • https://fizakilugoleji.weebly.com/uploads/1/3/1/4/131438405/f5bb35d255c76.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/tesasubawalozan/les_nuits_d_ete_translation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f705d06f-eb08-4c0b-876a-2d2d00c3fc2a/who_said_did_i_do_that.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a6c66e2-f572-4e29-b0f1-ac7a90f3bd91/niro_kia_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91d20021-d270-4b82-b5dc-79e03e27f01d/79531926867.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17075e5f-4e26-45ad-98cc-a008a8816d23/45870959139.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_off0000b1e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E5 5396 bytes
SHA-256: d0eb20e96ceaba79cd825b214d6958a8336d248db2bb4a5344cbebb6156ad3d6
font_01_sfnt_off0000c415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC415 10120 bytes
SHA-256: e13b3395ef78d38bc1f9f7730dcd6368237776bc038297b61526b9e1bc5ffde6

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