Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f8dc8f7724e115d…

MALICIOUS

PDF

75.8 KB Created: 2021-01-30 05:39:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 3fdb93705263fed87b833327e9b9c799 SHA-1: 94c61f769f0eb022defc9f5167442c31064ef25b SHA-256: 2f8dc8f7724e115d029fb8be137db075df2a5e0cb32b98f8632f4dcca5e47e4a
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm used for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

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
  • 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://jottigo.ru/123?utm_term=viewing+guide+for+the+giver+movie+discussion PDF link annotation
    • https://dupagerenukuxat.weebly.com/uploads/1/3/4/7/134751723/f074782.pdfIn PDF document text
    • https://finamiwowekizo.weebly.com/uploads/1/3/2/3/132302732/a66cd.pdfIn PDF document text
    • https://bujipivew.weebly.com/uploads/1/3/4/1/134131373/simebiba-wivinam.pdfIn PDF document text
    • https://disebaxixifos.weebly.com/uploads/1/3/4/7/134714932/gawugoxewukef_wonozo_jetutobo_zorukarurilewen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501057/normal_5fd200b1d9b65.pdfIn PDF document text
    • https://cdn.sqhk.co/zetanitanedo/KnYShfl/brain_test_tricky_brain_puzzles_riddles.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453550/normal_5ff69d19784c9.pdfIn PDF document text
    • https://soguleta.weebly.com/uploads/1/3/4/3/134305846/tuzexu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449187/normal_600ca6fd7adb7.pdfIn PDF document text
    • https://xezamojukugenu.weebly.com/uploads/1/3/5/3/135316948/jelek.pdfIn PDF document text
    • https://mutudibekakifu.weebly.com/uploads/1/3/1/3/131398274/e6960f6ad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393180/normal_5fd08e6c78808.pdfIn PDF document text
    • https://damobupakul.weebly.com/uploads/1/3/1/4/131453350/5a70073c248f.pdfIn PDF document text
    • https://gunobodupisar.weebly.com/uploads/1/3/4/6/134677737/zudafodaxolu.pdfIn PDF document text
    • https://lepifokofufup.weebly.com/uploads/1/3/4/0/134018260/4723411.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/pogolo/76205946711.pdfIn PDF document text
    • https://s3.amazonaws.com/fewifuwu/kazage.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_off0000ec08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC08 5312 bytes
SHA-256: 19d2718e7ee5b896b315a245fdf69c161270226eb0143b3af7d619e3ea88ceed
font_01_sfnt_off0000fe1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1A 10412 bytes
SHA-256: 482b5f37f1fbb15d8cd47f278459103d8796fb204972c7af5e6b3e0c098c692b

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