Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b794e9fbffe9eec…

MALICIOUS

PDF

95.8 KB Created: 2020-11-18 15:12:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: bdd132d556d7b852697ce7c8b6b6f91c SHA-1: df2d340300a2e9e5eb16393d5ffc217377a517d6 SHA-256: 4b794e9fbffe9eec5ebcd00092d6b7a8ea865339f76c66cc2f800036fc84ef5e
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 0.9996

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://trafficel.ru/strik?utm_term=dragon+ball+z+ultimate+tenkaichi+tag PDF link annotation
    • https://mamubata.weebly.com/uploads/1/3/4/5/134598765/cd1e6bd57b.pdfIn PDF document text
    • https://satatemusuk.weebly.com/uploads/1/3/4/3/134311800/0bf25d5f0cec.pdfIn PDF document text
    • https://damoleruli.weebly.com/uploads/1/3/0/7/130776580/befosobima-poseziwadadot.pdfIn PDF document text
    • https://xuvuluvibes.weebly.com/uploads/1/3/4/4/134494650/4490bf98e5254.pdfIn PDF document text
    • https://segawerod.weebly.com/uploads/1/3/4/3/134313685/7933638.pdfIn PDF document text
    • https://bafovulik.weebly.com/uploads/1/3/1/0/131070506/siwekofiwiviz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368996/normal_5f9611421d7f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383132/normal_5f9f1e585ecc5.pdfIn PDF document text
    • https://ziripovopibew.weebly.com/uploads/1/3/0/8/130874468/4350661.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/2830b523-9fb3-42f7-a11e-b9ba73b3c201/15662815744.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b87914cb-2eef-4220-8a83-c48c29f80e0b/comparative_and_superlative_worksheets_2nd_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51da8c5a-c8b4-44b9-bf34-f54c09378133/81869589109.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26431b55-0e1c-4458-9778-e50ece1bf8b7/xakanedabetasebedilav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0aae7662-db85-4dd6-9fe2-6bb8abd44ce3/rokilovefozumomeme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97632d49-55cb-40df-bca4-27187f29acc2/71688832306.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ecb4d68-3cda-4895-a6e8-9172514efe0a/94432181945.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11498 3992 bytes
SHA-256: 0ba978a9e3aaf475c73c85ce94184d17ef4d673b0a0f8f24cbbc6435ef1873dc
font_01_sfnt_off000122ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AC 5288 bytes
SHA-256: 223aac3e370e2e51cbe943825e800fbb75f6aef77a6fd49f9bc7b862948bc12b
font_02_sfnt_off00013490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13490 11768 bytes
SHA-256: 8234b7ec483ac3f6226989a84d2a538ed139fb6d0f47b00c6eadced5bb9d4e33
font_03_sfnt_off00015b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B7B 16284 bytes
SHA-256: bb2b89c1834086000fd496809597d39ebacb623fcad35ac6357d8a9f3e7b9aca

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