Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4fd4ea1c82c1188…

MALICIOUS

PDF

87.0 KB Created: 2021-03-15 02:14:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 7015f853a4c400edc5a040bc6891d5a4 SHA-1: 9b2925010b822c9d5c7a6a10872af2db0db836eb SHA-256: f4fd4ea1c82c118858a02d3d42503507846f2cf76b0a9081bac508f63bc38ee1
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for PDF_SEO_LINK_FARM, indicating it hosts a large number of external links disguised as PDF documents. One of these links, https://ponafet.ru/strik?utm_term=lactancia+materna+exclusiva+minsa+ppt, is flagged as suspicious. The ML classifier and ClamAV also identified this PDF as malicious, suggesting a phishing or trojan distribution attempt.

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://ponafet.ru/strik?utm_term=lactancia+materna+exclusiva+minsa+ppt PDF link annotation
    • https://cdn.sqhk.co/nuroteditu/hbmhiOo/portable_trailer_products_inc.pdfIn PDF document text
    • https://zuwumepegowivos.weebly.com/uploads/1/3/1/0/131069935/4f05e6d62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480749/normal_5fd977b964e17.pdfIn PDF document text
    • https://cdn.sqhk.co/sivadapexiri/d7zCunh/xogetanirezexoval.pdfIn PDF document text
    • https://papenuxid.weebly.com/uploads/1/3/0/8/130874395/bifomij_dogerelivalev_jatajowuwisadom.pdfIn PDF document text
    • https://cdn.sqhk.co/giwitosak/HidB0hj/munarud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415304/normal_604cddebb677b.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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/89dc01de-74da-4204-aa42-5ab31b602c36/how_to_defrost_samsung_ice_maker_rf23j9011sr.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d000ae7c-f194-47d1-9002-86a61303bbd2/2014_chevy_malibu_led_tail_lights.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1a9902e-3a78-4110-924c-d183e1609b15/18371443026.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c00235b3-7537-47b5-a6dc-1886d9cecd3c/cazadores_de_sombras_serie_netflix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c9a39e5-32f4-4981-ab2f-50d3c478652c/how_to_add_film_to_polaroid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84b7b0b5-1385-4455-b7b9-48bef4887641/gadawuxukerutujojibumadip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddad52eb-10f6-4da1-bc33-06496f65145a/54206643579.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/494140c3-892f-4235-89d9-055ff8cd58c7/xevaxotozufaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b2b6ab1-f020-4ef8-839e-f86c24d43a3d/75575742291.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adfccc1d-7b68-459d-8aa0-588a4da46846/27992090727.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c18e3e3-b72e-4537-a869-eb757d0b4be0/24073954387.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_off00010c3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3B 1604 bytes
SHA-256: 2865e7baf948dad665c6444796ca384115bd4b2b4fd1fe86d29b5d3d3d6405bf
font_01_sfnt_off0001145e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145E 5148 bytes
SHA-256: 083b4ebdbdab147ea7cc32814916d7138b9a85f699ca1a5f7fc56dc32f70ae0e
font_02_sfnt_off000125d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D7 12004 bytes
SHA-256: 7f429320a3e2fb2b65b91b7e1698be44ac4b9e0457194d5e1140d74d9b9535eb

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