Malicious PDF — malware analysis report

Static analysis result for SHA-256 17f99f423a02bce0…

MALICIOUS

PDF

80.5 KB Created: 2021-03-13 18:56:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7437c1a275f7ab18d60ee1585c56ade1 SHA-1: fe75fdc0a5636bb4848dcbc757e4234db4d91124 SHA-256: 17f99f423a02bce0810ec3472242ac15293544a797f1ec04e65ea559aeab1b18
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-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.
  • 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://nipisod.ru/strik?utm_term=best+price+front+load+washer+and+dryer+set PDF link annotation
    • https://cdn.sqhk.co/dorodidur/Aghgihf/13246971494.pdfIn PDF document text
    • https://cdn.sqhk.co/boguzivipel/gjtegfJ/85538429892.pdfIn PDF document text
    • https://cdn.sqhk.co/gituridewo/ihcihEf/sijunilanogavezumawagat.pdfIn PDF document text
    • https://pajenugemin.weebly.com/uploads/1/3/4/6/134677616/bujuduba-xosinotuto.pdfIn PDF document text
    • https://cdn.sqhk.co/fetadupozo/ifeflgc/tap_titans_2_artifact_tier_list.pdfIn PDF document text
    • https://zowisedaro.weebly.com/uploads/1/3/4/3/134355737/jekugenedawupuzanab.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/f72cd8ae-e066-4b1e-93b4-5b05aeba9def/cant_open_door_on_neff_washing_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4925c59-448c-4329-8773-32105b35a89f/fipumodebin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38238a63-84ef-41d3-be56-ddd70e0f99fc/labefosejiwaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/200efc31-7a08-4a07-8007-2ad3f8900e2b/33225820002.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/caa06a7c-064e-4a48-b315-f3fd3afb8547/wejaritewakoze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d55c0e3-7865-4a93-9539-52fee054df38/mokelelemitejozudigixuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/439127d4-d3e0-486d-935c-afc18acc7342/seseniwobepawerakafogupu.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/bujigod.pdfIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/wedenefopaxujer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e049df14-c21d-40d9-9520-8312b1301d1a/bird_beaks_and_feet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/767d0bb5-5a61-431f-b355-3218b849a5ae/58943842119.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_off0000eff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF6 5272 bytes
SHA-256: 54ff751038a313800ba95e959986360c1bb6adfc9aa7adf5dc4234af3a869ebf
font_01_sfnt_off000101ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EC 10764 bytes
SHA-256: 61ab42fbc974293aff3a46b7d78e95573d708af382f652cf522746580b70217b
font_02_sfnt_off0001267d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267D 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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