Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f29abfd6da549bd…

MALICIOUS

PDF

90.6 KB Created: 2021-03-03 10:33:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 255a71729bc35a149141fce18edee377 SHA-1: dbb465e9f7e2551282f2dc015bbaeafcd4de514d SHA-256: 6f29abfd6da549bd2b6820aa381bcb03da4c466f159ff0ae375f1b30b1962be7
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs, with a significant number pointing to disposable hosting services. The embedded URLs suggest an attempt to redirect users to potentially malicious or deceptive content, masquerading as search results or downloadable files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://golowaki.ru/strik?utm_term=sketchup+make+free+2017 PDF link annotation
    • https://batapasupo.weebly.com/uploads/1/3/1/4/131482803/nobesebeje.pdfIn PDF document text
    • http://peskomment.ru/carrera_slot_car_troubleshootingbv01z.pdfIn PDF document text
    • https://wepusiviji.weebly.com/uploads/1/3/4/6/134661614/lilen.pdfIn PDF document text
    • https://rudusixan.weebly.com/uploads/1/3/0/7/130775573/xikodupexibiwin-lojedopaw.pdfIn PDF document text
    • https://jafedojinow.weebly.com/uploads/1/3/0/9/130969492/lafenulipe-pijenej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387408/normal_5fd622ee0e9bf.pdfIn PDF document text
    • http://rubeatyshop.xyz/kuwusovuwodimutot10p8r.pdfIn PDF document text
    • https://pewofofuvalok.weebly.com/uploads/1/3/0/7/130775386/aca98ede5036892.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408598/normal_5ffca50536f88.pdfIn PDF document text
    • https://vavinaxedekofew.weebly.com/uploads/1/3/0/9/130969509/rajutanazolomod_faparap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372371/normal_5ff64f78e5225.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465010/normal_5fed268df3614.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
    • http://luloxefisamo.rf.gd/how_to_speak_korean_beginners.pdfIn PDF document text
    • http://jarexuvi.epizy.com/bizajini.pdfIn PDF document text
    • http://xopemaw.rf.gd/los_vikingos_reporteros_de_la_historia.pdfIn PDF document text
    • http://kegunujav.epizy.com/57173878690.pdfIn PDF document text
    • http://favekagopu.epizy.com/electrocardiograma_anormal.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF7 5236 bytes
SHA-256: b4cdb60dacd0e863940134c45889177c481af3d31abb70d0dfef9f45b5f93f4c
font_01_sfnt_off000111d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D6 11620 bytes
SHA-256: 507fd28eeeb471101a6315746424c9ef98506628301ba42aac8edada51079733
font_02_sfnt_off00013912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13912 16320 bytes
SHA-256: bf5167c075d774c9e2ea62677ca3e8ada31171b92f4b1a4ec278e3e852de99fb
font_03_sfnt_off00014ea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EA6 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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