Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac7da71af7e71a40…

MALICIOUS

PDF

70.7 KB Created: 2020-11-11 00:01:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: bf0dda38d3a25a326a618fa92cb3e858 SHA-1: d8de58d03e086c24f50bf35cdf7e1e1699d90e3b SHA-256: ac7da71af7e71a4021175255cf512f50e46f1df9c7096b24df7c9f45ece3ddc7
156 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 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://traffnew.ru/strik?keyword=dragon+ball+super+dubbed+schedule PDF link annotation
    • https://xukarujejoxa.weebly.com/uploads/1/3/4/5/134597636/159d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408584/normal_5fa44b995d303.pdfIn PDF document text
    • https://fidurelofomus.weebly.com/uploads/1/3/0/7/130740547/532108.pdfIn PDF document text
    • https://jorogusanige.weebly.com/uploads/1/3/4/7/134715450/buwev_tigek_poluwusafit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379474/normal_5fa9c9128e03a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374535/normal_5f8a5dfae89a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452169/normal_5fa20d3d7b081.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388412/normal_5fa51f1cd1dd4.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/e9ecb4f9-62a4-4115-a525-b1fd7e748e3b/formula_for_dihydrogen_dioxide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/389cdb16-85a7-4ba4-a656-abb8319ee2c5/38205347441.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47647f71-fbb8-405d-9618-c6217ac3d586/vanedujisofoxigubujokide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6009485b-4d8b-4b05-ae49-b96af4e7bc92/jungle_book_characters_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e6a074e-ddd5-4b9a-95d9-7e8790fa745c/43594904703.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24347aec-bd31-422f-b2a7-d330f01bcf06/61814824850.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e078ce11-ee4e-4e1f-89c0-490befecad69/11734876908.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b100981e-796e-4c2a-960b-5ad8b029000e/xemegilatujanotogokesida.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_off0000d7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C7 5476 bytes
SHA-256: 1372ebbb1d25a7dc5becaec18282fd5220127435e486552087850f9126874067
font_01_sfnt_off0000ea5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5D 10620 bytes
SHA-256: 8afd9a68282245758991a15bdfbb03b161c1843de511bade3735c9f37e7e34a6

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