Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f6b74240fabb07b…

MALICIOUS

PDF

81.1 KB Created: 2021-04-08 16:12:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 459641b88db43dbe1a17bbd02c0bca6b SHA-1: 1243517f2b2892878196cd2ff39a58e6524e73de SHA-256: 5f6b74240fabb07be2821722c57a7c4abc6eee6ec684ad9a7224fd140362df52
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 0.9994

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://jottigo.ru/strik?utm_term=remington+pole+saw+chain+file+size PDF link annotation
    • http://nemosixumeki.mypressonline.com/lonely_planet_georgia_armenia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479224/normal_5fd172e60a789.pdfIn PDF document text
    • https://jesidovelagira.weebly.com/uploads/1/3/4/7/134705211/6df48f02da8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452373/normal_602bde3a0c83b.pdfIn PDF document text
    • http://jajuviramigawo.medianewsonline.com/c_video_tutorial_for_beginners_free_download.pdfIn PDF document text
    • http://ropogal.iblogger.org/ceramic_materials_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372980/normal_603ea1e439520.pdfIn PDF document text
    • http://dekagexagupeje.iblogger.org/boom_beach_mod_apk_ios.pdfIn PDF document text
    • https://tuledekubixa.weebly.com/uploads/1/3/4/7/134722649/1662798.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403273/normal_605f9681f0a49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450628/normal_601296fee10d1.pdfIn PDF document text
    • https://maladebo.weebly.com/uploads/1/3/4/3/134305387/fe412.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482863/normal_60119a70b078e.pdfIn PDF document text
    • https://pojasulexubu.weebly.com/uploads/1/3/5/9/135993084/1364577.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486566/normal_6001efdd8e960.pdfIn PDF document text
    • http://vogolimipogusoz.mypressonline.com/english_grammar_rules_bankers_adda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457330/normal_5ffe11f1f0af7.pdfIn 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/377d9eba-4f8e-40b8-8d8d-4f62b8ff76d1/starcraft_2_units_zerg.pdfIn PDF document text
    • http://mewozegi.epizy.com/43860488171.pdfIn PDF document text
    • http://nilixedenoxim.epizy.com/84914567055.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c537d1ea-c4d1-465f-bd50-286e5f1b6e85/g-shock_mr-g_mrg-g1000d-1adr.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63040057-cb4b-44b5-abab-8a06a15ffd39/27968344814.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c1f79c4-3f58-4a5c-bf9f-ddc7a5e40069/north_atlantic_treaty_organization_function.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE7 5480 bytes
SHA-256: cf68286e3525006bcf28af32ab04a0304ebce9b0d19403ccb7780cc2ef2889ad
font_01_sfnt_off00010e93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E93 11980 bytes
SHA-256: ebba928b4348b0c3071fde1276671105a25fac6738baee700149509faa216281