Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dd46e3b6a318bdb…

MALICIOUS

PDF

71.3 KB Created: 2021-04-03 16:28:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a92d0c6c76c144f9d9771b811f39204c SHA-1: 51471cd86cc6eada8690698b35fce660e0ef0fb4 SHA-256: 2dd46e3b6a318bdbf085f2f8a7b056867a9b999ce91029a836d3a345ff2a2d41
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing numerous external URLs pointing to other PDF documents. The ML classifier and ClamAV also identified it as malicious, likely a phishing or SEO spam campaign. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially malicious content, possibly for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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://maypoin.ru/award?keyword=pulse+oximeter+pdf PDF link annotation
    • https://mogopefisumiba.weebly.com/uploads/1/3/5/2/135295831/5058238.pdfIn PDF document text
    • http://merotudonor.mypressonline.com/caterpillar_c12_parts_manual.pdfIn PDF document text
    • https://wegesunovajoj.weebly.com/uploads/1/3/4/8/134887244/sivebokozitavu.pdfIn PDF document text
    • http://fipizilemuwob.medianewsonline.com/why_we_crave_horror_movies_rhetorical_analysis.pdfIn PDF document text
    • https://xufudigu.weebly.com/uploads/1/3/4/5/134515134/5051682.pdfIn PDF document text
    • https://waxaveroguwako.weebly.com/uploads/1/3/5/3/135344917/3928630.pdfIn PDF document text
    • https://saxurugilura.weebly.com/uploads/1/3/2/8/132814125/dusevesu_buzejumekasak_lewofizigaped.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rubaporejolo.rf.gd/38767114399.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/665b4025-3837-4b2f-b4fb-ce7cd4d19d01/how_to_reset_apollo_twin_x.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/characterization_in_literature_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f934ba7e-c418-4503-834e-ab7730ef52d6/71083901730.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3792c8f-9269-41ff-92d1-ce81f164fe84/wirewiketuvonasel.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/vizurososejul.pdfIn PDF document text
    • http://dukerorute.epizy.com/tetajupidelane.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bd38e61-ab4c-4b2d-94ed-0beb2175944c/case_study_phd_proposal.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_off0000daad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAD 5048 bytes
SHA-256: 844f41cb1d2e62eed62d0ac94bcb5b379666b4cef5fbd3d5b9719dbf9c2c0f21
font_01_sfnt_off0000ebca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCA 10940 bytes
SHA-256: 03265547981591a2cb54ebd8348eefcfb914dc6c99549d0d1f75d46d48a75633

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