Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b57281cdb0149aa…

MALICIOUS

PDF

221.9 KB Created: 2021-03-15 20:01:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: faf916d5656ef11fb0aaf8dd8bc2be64 SHA-1: c5f2e61c40620f164fe4d64b17051bdde111dc7c SHA-256: 7b57281cdb0149aadbd888da3e93b070968e64f226c78c423d42e7a4e6e8422f
136 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it's a phishing lure using an image to redirect users to an external URL. The embedded URL 'https://vilenefex.ru/123?utm_term=transformers+autobots+characters+pictures+and+names' is likely part of a phishing campaign designed to trick users into downloading further malicious content or revealing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 5

  • 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 lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://vilenefex.ru/123?utm_term=transformers+autobots+characters+pictures+and+names PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417648/normal_6033403a11bda.pdfIn PDF document text
    • https://risovokoxenixe.weebly.com/uploads/1/3/3/9/133997247/jekojotugitu-sobozed.pdfIn PDF document text
    • https://cdn.sqhk.co/kuderoxuz/RNgephg/jugar_candy_crush_soda_saga_gratis_online.pdfIn PDF document text
    • https://tesafugefiwa.weebly.com/uploads/1/3/5/3/135318727/zopagodeva-gajupamutojuxem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481990/normal_604a31a8902a0.pdfIn PDF document text
    • https://cdn.sqhk.co/kafekata/IhgEiie/sowuremeg.pdfIn PDF document text
    • https://cdn.sqhk.co/sadirorig/jjfW5hd/domuzumubozivotipo.pdfIn PDF document text
    • https://pijusutuwo.weebly.com/uploads/1/3/1/4/131407307/zirinelilu.pdfIn PDF document text
    • https://bigonokefexix.weebly.com/uploads/1/3/4/5/134518339/1999124.pdfIn PDF document text
    • https://bulugigedi.weebly.com/uploads/1/3/4/7/134714886/5381471.pdfIn PDF document text
    • https://cdn.sqhk.co/jojojidatun/dhaWdhi/chess_rankings_wiki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368977/normal_5ff686089d8b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444371/normal_60303b692baa0.pdfIn PDF document text
    • https://cdn.sqhk.co/xawobovuji/b80jbjf/pocket_watch_repair_portland_oregon.pdfIn PDF document text
    • https://muluxadi.weebly.com/uploads/1/3/1/4/131453645/46ca8a0f543.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/d704dd4d-bdd9-45a4-a37a-d0268dc0b1f2/59214392229.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12903cea-015d-44b7-8dce-f833b98b2228/20648764479.pdfIn PDF document text
    • https://b40f07b9-a98f-42b6-a6e2-5dc2c82ebb0e.filesusr.com/ugd/e949ea_06fdd05ea1b447a4b6409f350c2d99bb.pdf?index=trueIn PDF document text
    • https://6cda4dd4-8aac-43e7-8003-7c0eea9f7907.filesusr.com/ugd/34e26e_c4d5e436ba6a4100bb76b0e338e7dbf0.pdf?index=trueIn PDF document text
    • https://9e269ae7-c3cf-4b9f-bde2-1d9be064b7bf.filesusr.com/ugd/139869_71fd901b70584de08566f2c22b42264a.pdf?index=trueIn PDF document text
    • https://16cc4848-9a85-487f-bc1d-da55f68f8448.filesusr.com/ugd/dcf86b_8bca7bbe352e4ab8a3a2391ba184bde7.pdf?index=trueIn PDF document text
    • https://9ebe8999-295a-4f11-87dc-c96f3e1b46ff.filesusr.com/ugd/8de238_b5cb1e2d0275484ba13042095726740e.pdf?index=trueIn 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_off000317f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x317F9 6132 bytes
SHA-256: 1c54617c6dee356b852c7c1e92f1d8a4a8a99942264f3c4c659a15e51938ab80
font_01_sfnt_off00032cf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32CF6 5452 bytes
SHA-256: 02777f7e58ca62293b175a7cdd701b5eb9055bcbe2d40c3fc7d751344ba3fab8
font_02_sfnt_off00033f47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33F47 12144 bytes
SHA-256: 4a73c6359678e47f987495cccf818d7ff98ac81cfcde6f6e617b6a8a699b9cf7