Malicious PDF — malware analysis report

Static analysis result for SHA-256 56b2523edc7769dd…

MALICIOUS

PDF

106.5 KB Created: 2021-03-28 21:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 630c624c88cc1162e3ba99299a5dfef5 SHA-1: c9d6168329a8ae8079b9e84f94fbb0197bad1e9f SHA-256: 56b2523edc7769dd9aa6221fcc12f7b9e3cf56193b483c16cc222a4949e6ad7a
196 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one primary URL pointing to a phishing lure disguised as an award notification. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and heuristics suggest it is designed to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://zajinet.ru/award?keyword=invention+of+telephone+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373768/normal_6040b519671f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381340/normal_5fdc4579d4e99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413012/normal_60484f0f8ef39.pdfIn PDF document text
    • http://lotupojaxuvutix.mygamesonline.org/50008957601.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416806/normal_601280cb4ed38.pdfIn PDF document text
    • http://suvuxivenorum.mypressonline.com/xugoberufiso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492871/normal_5fece6517261c.pdfIn PDF document text
    • http://koxivesuvif.mypressonline.com/siwuga.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://67d298e0-85f4-4ad4-bf36-e1ac857e42fc.filesusr.com/ugd/b6bf5b_637b8652794c4317b0da345fe74d638c.pdf?index=trueIn PDF document text
    • http://lubuzasoxevixan.epizy.com/kepexatedel.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/19558550474.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/gekiluvu.pdfIn PDF document text
    • https://625f08e2-3d8e-45b5-8e8c-b95d001c5c7c.filesusr.com/ugd/d94ae5_00739d947bb542a2b007160704aec7e1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xuzed/12661650245.pdfIn PDF document text
    • https://s3.amazonaws.com/gagotaniwipure/32547893788.pdfIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/how_much_is_a_stihl_ms290_worth.pdfIn PDF document text
    • https://8d67285a-e3c5-4820-bb1a-bb91ce1079a6.filesusr.com/ugd/d54300_5ca44bbdf0b24eb38b63531a3e02a17c.pdf?index=trueIn PDF document text
    • http://tilukonera.rf.gd/95109844390.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/biddeford_heated_blanket_top_light_blinking.pdfIn PDF document text
    • https://s3.amazonaws.com/zedudo/canon_580ex_ii_not_firing.pdfIn PDF document text
    • https://5926284e-b61c-4ed0-95e5-27b9feedd2c3.filesusr.com/ugd/50c35f_aca49b2996ac4adda2e42999b7f519b2.pdf?index=trueIn PDF document text
    • http://sosewovitifofus.epizy.com/column_addition_and_subtraction_worksheet_year_3.pdfIn PDF document text
    • http://tivakifuzir.atwebpages.com/2513189357.pdfIn PDF document text
    • https://f495c71d-628d-4070-9a3d-b699cbb46ba4.filesusr.com/ugd/d99ef3_95ca17f3b69a4c789d98667514e6ecb3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/galuzirasogetisotid.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_off00016437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16437 4644 bytes
SHA-256: 683a789a152338750731c31da473913921e236bb6d78bb35babc95428e95f594
font_01_sfnt_off0001740f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1740F 12008 bytes
SHA-256: df968fb673843c25bfeb10f8d91c77cdaa518876ce127a738867776353e10588