Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef61111cd5a98d66…

MALICIOUS

PDF

63.0 KB Created: 2020-12-20 20:21:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 0462a01b06f4a3f7186972cc8a0526d5 SHA-1: 80fb324e55222c67d084ef8713cc8fe1e02a2751 SHA-256: ef61111cd5a98d66ac54773e6829eeab8d3998b1befa60e60b0ebcab2c43f8b5
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One of the primary external URIs points to 'traffset.ru', suggesting a malicious redirection or phishing attempt. While no scripts were explicitly extracted, the PDF structure and the presence of many external links indicate an attempt to drive traffic to potentially harmful sites, aligning with spearphishing tactics.

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://traffset.ru/aws?utm_term=ayyappa+swamy+bhajans+patalu PDF link annotation
    • https://gokopawe.weebly.com/uploads/1/3/4/4/134493337/40b808dd9b7.pdfIn PDF document text
    • https://fedufifor.weebly.com/uploads/1/3/4/8/134894833/68705.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486523/normal_5fb498e5c2273.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501233/normal_5fbb9224624bf.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/6421b1e0-224b-452d-a9ed-6afab0e339ed/kuxetiwifajuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4484c3a6-5d3c-42e7-bfbc-247306fde51e/87294789315.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc2fdfc0-1b3d-42d9-a109-001d1b8e46e3/sir_william_crookes_fun_facts.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/10170379848.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/anopsia_definicion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dea2411f-080d-4e49-b035-a528a5a9cb5f/14414484641.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ff94bff-3166-41fd-b17e-20a3adf46a3a/81186827273.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/ledefofo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a887312-33bc-4f38-8422-63190d394549/bizisixoforan.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_off0000b0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0DD 4968 bytes
SHA-256: 3bfc2698db03be393327cd21f0513c58f1bdcebd114f785bf32542cb5a07a201
font_01_sfnt_off0000c1ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1AB 9312 bytes
SHA-256: ab8e7647b20a103572013be5ca169c4fcd4ac2313327a58a398c40be4b1415d0
font_02_sfnt_off0000e170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE170 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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