Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ebd2c2a41503c16…

MALICIOUS

PDF

66.7 KB Created: 2021-03-25 07:53:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 429f2108eba3ff564372af74b91116fb SHA-1: b96f15d8d87666fc707ff280c7a969f6907c239b SHA-256: 5ebd2c2a41503c164be8935e07a051a59f4f76f08a23816426c0b7d25a8acb2f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/123?utm_term=android+byte+to+hex+string PDF link annotation
    • https://pufukowog.weebly.com/uploads/1/3/4/5/134583281/9417144.pdfIn PDF document text
    • http://texoraw.sportsontheweb.net/79982258730.pdfIn PDF document text
    • https://vitedilerag.weebly.com/uploads/1/3/4/3/134344875/3042754.pdfIn PDF document text
    • http://vobalemujumojak.mywebcommunity.org/zutoxapekiworej.pdfIn PDF document text
    • https://laxefepi.weebly.com/uploads/1/3/4/5/134528647/najalenigilexubozo.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/815cc530-7a8d-495e-8890-3d8f112f737c/vaxajaguzuderijagoxu.pdfIn PDF document text
    • https://7be326e9-a1fd-4761-a84c-83c904220737.filesusr.com/ugd/37e945_d7bf99c722d04170b32b0dce44145e91.pdf?index=trueIn PDF document text
    • https://989244f3-426d-4557-b4f1-0018dac9047c.filesusr.com/ugd/57c819_53ec577bce144832a387c93ff34215cd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/75bcb161-d6e7-40ce-80ff-555dc57c8dc1/70970050075.pdfIn PDF document text
    • https://d71fc03c-aea6-48f7-a990-8afffb22108d.filesusr.com/ugd/3de8a6_2f9b94ef3c7d46e7be3fd158c5b803c4.pdf?index=trueIn PDF document text
    • https://0a38098d-26c8-4844-ab0b-2dfc398d7f8d.filesusr.com/ugd/fffd55_77154c99a03846908783774b5c6d51a8.pdf?index=trueIn PDF document text
    • https://e9593579-f51f-4dc6-af55-2543ab512b45.filesusr.com/ugd/37952c_23bd254b697f4ec9937c2b7b6c7bdb41.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/16465fef-fc99-4d0b-be98-4c91a1d56da7/dagom.pdfIn PDF document text
    • https://d64d5b41-a66a-4b78-b87f-0feaf8e9cf76.filesusr.com/ugd/cf1aed_7c2fa9a4bb684109a0a4e6421b617912.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0174def8-bce3-4ca4-8cb1-9ebd465aaf66/xikidijuzogotal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/976aa756-dfe4-43cd-9c82-da9ad188aa9e/84542827095.pdfIn PDF document text
    • https://fac30f9c-1bc3-4ff6-ac40-7ced1d2a170b.filesusr.com/ugd/3b7182_90addeb9670946a78be4e331e6cd2592.pdf?index=trueIn PDF document text
    • https://0e01c86c-6ad9-43de-bc04-b8819f410213.filesusr.com/ugd/73c254_e2c47c4609de481f914ca0cb622633c4.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C9 5144 bytes
SHA-256: f11bb43b194a7af8de2014bbbe7692f6acb25006f7c1bc0e02c109e6309a27a9
font_01_sfnt_off0000d84f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84F 11020 bytes
SHA-256: ea1835b86174ea5e384208aaba916346ef8896a184e527a29dca9a765035e78e

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