Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f7731b49a56e28f…

MALICIOUS

PDF

74.6 KB Created: 2021-02-28 09:02:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 0c4a6c0beb59d6975fc49a868a71b7c9 SHA-1: b48574e8d53cf19ac5fbe7326a2e04c04a2749ee SHA-256: 9f7731b49a56e28f7eb4bb9839a795f5455188d0b26c6fbea67da0b7fe95f875
256 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://giruwaferelesed.weebly.com/uploads/1/3/4/8/134850821/ziganobumakonivo.pdf.
  • 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://maypoin.ru/award?keyword=night+owl+security+camera+app+for+computer PDF link annotation
    • https://giruwaferelesed.weebly.com/uploads/1/3/4/8/134850821/ziganobumakonivo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493245/normal_602d40df6e04b.pdfIn PDF document text
    • https://kebuwusatame.weebly.com/uploads/1/3/5/3/135343151/1628266.pdfIn PDF document text
    • https://jarajegixam.weebly.com/uploads/1/3/1/4/131437089/391273eebcc1ed.pdfIn PDF document text
    • https://cdn.sqhk.co/bepeguvovori/oljiIib/dj_song_player_app_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368496/normal_5fc8b37326ff7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366044/normal_602d9cad3074b.pdfIn PDF document text
    • https://cdn.sqhk.co/pabelemusib/bRX3heG/fallout_shelter_cheats_android_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/zifalulog/PMShdhg/82735168676.pdfIn PDF document text
    • https://cdn.sqhk.co/defisepeniba/pjdhdhj/this_war_of_mine_ps4_review.pdfIn PDF document text
    • https://cdn.sqhk.co/mowamukar/iBPjaje/three_kingdoms_2010_online.pdfIn PDF document text
    • https://cdn.sqhk.co/turogepufe/mij4iea/58789228400.pdfIn PDF document text
    • https://cdn.sqhk.co/laruxibut/rqnjhdo/tedev.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/mivokozibu/aerodrome_manual_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/56461800516.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_off0000e755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE755 5592 bytes
SHA-256: 3cada49ad334a993aece25e39a3dd3d1a3b3118d64dc0abaad7407ac5c9dd139
font_01_sfnt_off0000fa5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5C 10252 bytes
SHA-256: 254f40372648563773be2d5fd6d07eeef3443ec65a808aa33485776dcfbd6349

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