Malicious PDF — malware analysis report

Static analysis result for SHA-256 d992e9e1521efd19…

MALICIOUS

PDF

74.3 KB Created: 2020-11-29 21:48:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 04b595c89fa76719959b898aeeac2a5b SHA-1: 83a0ad01708f8ad0870af034b954ebc93fbcff4c SHA-256: d992e9e1521efd1978330ccc5b9c9162f64d2f52194d0d86b6aaa15a636c3413
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of these links, 'https://traffking.ru/123?utm_term=alternatives+to+adderall+for+adhd+reddit', appears to be a lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure suggests an attempt to drive traffic to malicious or SEO-manipulated sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://traffking.ru/123?utm_term=alternatives+to+adderall+for+adhd+reddit PDF link annotation
    • https://wetuxabo.weebly.com/uploads/1/3/0/8/130873937/1428589.pdfIn PDF document text
    • https://zozelezike.weebly.com/uploads/1/3/4/4/134434207/7aacbc5df35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376849/normal_5f9e8f3f3954a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479210/normal_5faf8ceae7c65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454995/normal_5fa2a7ad118f7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/ec7f060a-bd9c-49df-bccf-e324570a6851/91287022233.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/41444155430.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67989b1e-0d45-46fa-942b-19f937cc831c/sazan.pdfIn PDF document text
    • https://s3.amazonaws.com/ninazarila/44460301884.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/57383241950.pdfIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/21691446028.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64028f3c-b569-47a8-a1eb-266907985287/84235911924.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed11975c-ec4a-4ddf-a8c9-4b1b59b10f18/carlos_xuma_ultimate_inner_game.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_off0000db28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB28 4832 bytes
SHA-256: 63d85b161be58f1218c546534a2845c6593acd96ee867b4e0b932d606021f656
font_01_sfnt_off0000eb87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB87 10092 bytes
SHA-256: fa6bd2dc5905c8cd3fe55eaff0f3a64c9554860edcef09025a98324c50dd6385
font_02_sfnt_off00010e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E25 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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