Malicious PDF — malware analysis report

Static analysis result for SHA-256 a95bb369ebe060ad…

MALICIOUS

PDF

127.8 KB Created: 2021-02-26 20:42:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 28fcdbfbd68a9a9a093a1167388d46bf SHA-1: 9e093148fe5f9b3343c501a635f9ca296f5ae667 SHA-256: a95bb369ebe060adf105e9bf045e0c604426e1ec094c202cb8c82680c6133e04
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://baarspo.ru/aws?utm_term=sas+urban+survival+guide+pdf PDF link annotation
    • http://securityofusersdevicesonline.site/zamogonawokuxeky3bwn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386363/normal_5fd39cbf498f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459034/normal_5fdbfa7548b5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480581/normal_602f95b7a524a.pdfIn PDF document text
    • http://logmeinnow.xyz/43700615211dh15k.pdfIn PDF document text
    • https://wugedelujexot.weebly.com/uploads/1/3/1/4/131456191/zarez.pdfIn PDF document text
    • http://imedo.ru/how_hard_is_it_to_learn_to_read_arabicwtcfu.pdfIn PDF document text
    • http://front-glass.space/boys_brigade_uniformrvmc1.pdfIn PDF document text
    • http://lazerepil.site/dagezetewodipixetolevurey6c78.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472788/normal_5fee220e67515.pdfIn PDF document text
    • https://lebabipiw.weebly.com/uploads/1/3/0/9/130968925/felegepoxibepuv.pdfIn PDF document text
    • http://copyrightshelpcenter.com/xogepefelb475t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463262/normal_6030a87fbb361.pdfIn PDF document text
    • https://pigiwikabulate.weebly.com/uploads/1/3/1/8/131856715/fb7987.pdfIn PDF document text
    • https://kesegupopu.weebly.com/uploads/1/3/4/1/134131766/7692031.pdfIn PDF document text
    • http://hargotel.xyz/85970113162k88ko.pdfIn PDF document text
    • http://nanolenka.xyz/warriors_don27_t_cry_full_bookplpgm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tezafafowajij.epizy.com/xalosetupen.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_off0001b5c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B5C6 5512 bytes
SHA-256: 8cca8601b2e4a3a4d9cb0e98ede347b29ab488f2fb6326a37de0438e6e435dfd
font_01_sfnt_off0001c891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C891 12048 bytes
SHA-256: 5c6ebfba40a7346d563866acf4c951629ae741585adaa9b0bfc728ecac3606b2

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