Malicious PDF — malware analysis report

Static analysis result for SHA-256 df4ef7bf58fa6e38…

MALICIOUS

PDF

88.0 KB Created: 2021-03-17 23:54:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8fdc8d38ba35cda757cfc78793b91d92 SHA-1: 70146a31dc23284bc9e6d216300b7482fe07a24d SHA-256: df4ef7bf58fa6e3858299f9256bf0d168ee1b482523915637c12c80b43f8cc5b
186 Risk Score

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 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/wix?keyword=city+of+chattanooga+business+license PDF link annotation
    • http://ita-yog.space/57020955441l03or.pdfIn PDF document text
    • https://cdn.sqhk.co/zoboxoba/hjg7Kjc/20168825339.pdfIn PDF document text
    • http://gakivako.iblogger.org/4182762795.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzemesafe/a9igjif/43952606868.pdfIn PDF document text
    • http://prazdnikprosto.ru/94119994633jnppp.pdfIn PDF document text
    • http://sobakin.space/polk_omni_sb1_plus_bluetooth_setuptyeoh.pdfIn PDF document text
    • http://xokubenafap.66ghz.com/50710828289.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rusuxipek.rf.gd/acca_f5_examiners_report_december_2017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12608201-2c11-4319-9e83-9998c1d85882/nubisoker.pdfIn PDF document text
    • https://6184de0c-c318-42a7-882e-c5ddc63b817d.filesusr.com/ugd/1c8c1e_eedb54285eb944a18f6084b6f01aa10f.pdf?index=trueIn PDF document text
    • https://bf6af823-cb0d-4ee8-9d5b-4f0b1de5ed24.filesusr.com/ugd/9eb187_9301a8499a11463f809daa642d4979ca.pdf?index=trueIn PDF document text
    • http://mibexalaxesu.epizy.com/44566336790.pdfIn PDF document text
    • http://fedukiz.epizy.com/can_can_violin_sheet_music_easy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d27689eb-5a96-4f49-ad1d-b2bb6e8b4f2f/50513397564.pdfIn PDF document text
    • https://cd9ed9ec-87d1-42be-9198-0b2de6c1db4d.filesusr.com/ugd/158fb9_7bf91f43ee1448948f599e67a0b7ee23.pdf?index=trueIn PDF document text
    • https://2dc0326d-ac60-47d8-bf46-f2dc9d334570.filesusr.com/ugd/21b4a7_3dcb01968bb849b08435f84c63a5c23b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc8240f8-cda0-41c5-a704-b7ca1ea70625/1166760021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43da275d-70a2-48da-974f-7560669d41b9/how_to_talk_confidently_in_a_meeting.pdfIn PDF document text
    • https://f72b89be-0fa6-41ee-8162-331329ef78ce.filesusr.com/ugd/95089d_ddd37fed9bb640b8988d03ca9c60b9e2.pdf?index=trueIn PDF document text
    • https://2a07c75e-e898-48ba-b326-4cccc82d0599.filesusr.com/ugd/ff154e_51e315c04c8e461fab26d2b9e2a8bf5c.pdf?index=trueIn PDF document text
    • https://6131fb9f-3080-406c-a6ab-c4686b6a2f6f.filesusr.com/ugd/52be6f_1a0b4f67492847e09c17dd8838f6208a.pdf?index=trueIn PDF document text
    • https://f459ab6e-ac57-43ce-b83a-1524846427e4.filesusr.com/ugd/938c70_afdc9e8eb2a94d26ba1b5715a755730a.pdf?index=trueIn PDF document text
    • https://ed4d48c2-14ea-47f5-a89a-b82193587323.filesusr.com/ugd/8ce377_56573000e1d34fc2997eb9c208a94fce.pdf?index=trueIn 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_off00011c95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C95 5196 bytes
SHA-256: ac83709442258c87362c5abecf09a2b97c2c4b547cc03defe69f28043af54e07
font_01_sfnt_off00012e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E52 10628 bytes
SHA-256: b22baa641c00ebc8094f8e25e736c92f8080098ce654ac3ad6cac6ac3663b5a6