Malicious PDF — malware analysis report

Static analysis result for SHA-256 3af1f799f6323506…

MALICIOUS

PDF

85.0 KB Created: 2021-06-09 10:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 957a16a83c397d463f00fc9411e8b20a SHA-1: 2b9b95d65dc27869fbc79c2c724039d40510b63f SHA-256: 3af1f799f632350680fd06d54865863cfd62723aee59d07dc84fc433173fa5d6
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a link farm hosted on disposable domains, with one URL specifically mentioning 'gta sa apk android 1' to lure users. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a malicious intent to redirect users to potentially harmful content. The ML classifier and ClamAV detection further confirm the malicious nature of the file, suggesting it is a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://medvor.ru/pbw?utm_term=gta+sa+apk+android+1 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4374859/normal_5fc59c4031690.pdfIn PDF document text
    • https://donadoleli.weebly.com/uploads/1/3/4/5/134519335/155d7aae8f0999f.pdfIn PDF document text
    • https://sefoxobifi.weebly.com/uploads/1/3/6/0/136093232/6531447.pdfIn PDF document text
    • https://lixabepona.weebly.com/uploads/1/3/4/5/134530066/boretavur.pdfIn PDF document text
    • https://kovorugoza.weebly.com/uploads/1/3/1/3/131383314/gipitowosud_kukepider_faxijo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374686/normal_5feb083c42cf5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452851/normal_6039dcb997632.pdfIn PDF document text
    • https://motaxajofepox.weebly.com/uploads/1/3/1/3/131381237/6763723.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4385214/normal_60b47ada349e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388067/normal_60bf92176176f.pdfIn PDF document text
    • https://ditoramaw.weebly.com/uploads/1/3/4/7/134724618/fugojexavuben.pdfIn PDF document text
    • https://lewefuno.weebly.com/uploads/1/3/4/0/134041273/bixuwagusa.pdfIn PDF document text
    • https://pugewolusaw.weebly.com/uploads/1/3/1/4/131453132/tonusevenizul.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380073/normal_5ff7555521832.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469350/normal_5fe74045d4551.pdfIn PDF document text
    • https://viluxesoxumubi.weebly.com/uploads/1/3/1/4/131406714/sarar-vabujuxib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459328/normal_606d167c250a8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://nugewil.pbworks.com/f/75901853819.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5744996-37a9-475f-9e06-ed3afa49ad81/58581842996.pdfIn PDF document text
    • http://nawujewo.pbworks.com/w/file/fetch/144689700/fezovewula.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77b0b81b-7c88-46b8-8a05-b5322b7f3c93/misoturodaximoguzolaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89c2a465-3b9f-4bb0-8386-0e9497e53a7f/88346523880.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AE 4740 bytes
SHA-256: b7a84ac24a9406bc84bfb403539bd4dda362fdf112516bf3dddb5b9b10338359
font_01_sfnt_off000111cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CF 11960 bytes
SHA-256: 9e697c7d6af4b8724895f901b240c833b6999ee6d0bb18d7fedc69f6c65e7e9a
font_02_sfnt_off000138e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138E1 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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