Malicious PDF — malware analysis report

Static analysis result for SHA-256 bed12ffa0b5ee1b5…

MALICIOUS

PDF

82.1 KB Created: 2021-04-16 10:58:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 17da7871206943a6f3c36c8595258928 SHA-1: ec8dabf286bccd88599c5cebc0a8eb39ec697be8 SHA-256: bed12ffa0b5ee1b524d94f9577c15727e8dfad0d7399e15d0523369fce26f6f3
244 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a significant number of embedded URLs, many of which are associated with malicious redirectors or disposable hosting. The heuristic firings indicate a link farm designed to redirect users, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=the+defining+decade+why+your+twenties+matter+and+how+to+make+the+most+of+them+now+pdf In PDF document text
    • https://gokatejasefe.weebly.com/uploads/1/3/4/6/134650338/nirokumi.pdfIn PDF document text
    • http://dronextactical.xyz/how_to_make_a_verizon_jetpack_fastervm69v.pdfIn PDF document text
    • http://importants.space/xutudtfmv8.pdfIn PDF document text
    • https://lufojegixibebaz.weebly.com/uploads/1/3/1/4/131407324/judivuwi.pdfIn PDF document text
    • http://kuxafazugof.iblogger.org/95619300751.pdfIn PDF document text
    • http://tetekegobuj.iblogger.org/27848617081.pdfIn PDF document text
    • http://aires.fun/zetiwofedemazubag39gx.pdfIn PDF document text
    • http://idealica-official-it.website/jevosibusezulinomicsw5b.pdfIn PDF document text
    • https://fivoputan.weebly.com/uploads/1/3/1/4/131408393/ad17b6de95d7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ddd59a73-be73-4575-bd7b-2e5900175f8b.filesusr.com/ugd/5dc0ef_e89a491ff5c94f74b316c845f08989ed.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b01c3286-50b1-460c-86bb-36c85990a25f/used_murray_riding_lawn_mower_bagger.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/83749903299.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/jazaruwanosawiwile.pdfIn PDF document text
    • https://s3.amazonaws.com/genijusemu/attendance_management_software_v1._6.pdfIn PDF document text
    • https://e437b920-fa79-41d5-b67c-0ca059f4e77a.filesusr.com/ugd/d97c10_00eb9c4f477740bb8bba852f9613d8b1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fivebo/cuando_una_pareja_se_da_un_tiempo.pdfIn PDF document text
    • https://6c8027e1-9878-41b3-a9ef-32ba2b6bcd02.filesusr.com/ugd/185811_520f7c869eb644d2ae45a272dd93ac24.pdf?index=trueIn PDF document text
    • https://eadb47d6-6712-4ecd-aa5a-2cdcf2d90b86.filesusr.com/ugd/c844bf_0b68b43f33404065aef7aa665f7c318f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/putelekireza/dukafaditonoli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f72baed-33bf-4864-83aa-3a0e3afac581/calories_burned_doing_1000_jumping_jacks.pdfIn PDF document text
    • https://c18d9829-3add-4afa-bc87-35007fe3998a.filesusr.com/ugd/70c1ec_955c00f7d236447b9e4db706be6cf78d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d4ef7d0-6e61-4d45-96cb-f3349ce031c3/patterson_james_books_in_order.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c221c67b-2168-44f2-aef3-cb1a11c3d406/tited.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0adf6f6b-9235-44b8-98aa-895c5a0c7b27/tefavaje.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_off0000f1e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E3 4772 bytes
SHA-256: ff2ddfaac2221614dfe1756e3c8729dbefc3ceeac46efb57c78102c3542e5363
font_01_sfnt_off00010299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10299 5744 bytes
SHA-256: 9b9bd8a338595f83ea0c9d65639f99dee310da0537b365493807ede85e3ed8a1
font_02_sfnt_off00011619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11619 10632 bytes
SHA-256: bab0c1135ce682cbd6aafae15007c274ef2aee72aeefe2e276b202e1e40238cc

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