Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5e2b8aa75b14690…

MALICIOUS

PDF

88.8 KB Created: 2021-04-02 17:25:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ef7ca57d665628a11aba76c91fce5da7 SHA-1: f445c8f5e17e9622a454bb4eb3ee61329f8ee661 SHA-256: f5e2b8aa75b146905bc0e32ecf134b57990fbe1c9ca4f00dde53c4fca78cc326
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, with the primary goal of directing users to potentially malicious or scam websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO manipulation. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit search engine optimization or user curiosity to drive traffic to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://jumiwimov.ru/award?keyword=c+programming+book+pdf PDF link annotation
    • https://cdn.sqhk.co/ganidabizi/jjeoAhd/magic_castle_hotel_popsicle_hotline.pdfIn PDF document text
    • https://cdn.sqhk.co/kelifevaz/ahjhgdL/ludovico_einaudi_tour_2021_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/jugomuzuteb/DUHjieg/dusezumopidopi.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/Li8Ugih/87004459281.pdfIn PDF document text
    • https://resumasilazivo.weebly.com/uploads/1/3/4/5/134509929/561b5d5.pdfIn PDF document text
    • https://cdn.sqhk.co/wibetaxor/idjh0jd/1255321962.pdfIn PDF document text
    • https://cdn.sqhk.co/madumubo/jjibe4M/52151749457.pdfIn PDF document text
    • https://cdn.sqhk.co/totimujid/cKjgNib/mobile_device_helper_itunes.pdfIn PDF document text
    • https://medivurufif.weebly.com/uploads/1/3/1/4/131407406/e4f28022fda04cc.pdfIn PDF document text
    • https://cdn.sqhk.co/sekigizakeku/djiJ1gj/25859304235.pdfIn PDF document text
    • https://dafubadam.weebly.com/uploads/1/3/0/8/130874240/wowokafodovu-sumisixunadod-mokilenabenex.pdfIn PDF document text
    • https://cdn.sqhk.co/pininipata/ZgjqNVp/world_travel_market_global_trends_report_2020.pdfIn PDF document text
    • https://zivadufo.weebly.com/uploads/1/3/0/8/130874541/7194215.pdfIn PDF document text
    • https://nogiwesetegi.weebly.com/uploads/1/3/1/6/131637024/8e8e3ca.pdfIn PDF document text
    • https://wojanoxunoliwam.weebly.com/uploads/1/3/5/3/135394081/2fbdc.pdfIn PDF document text
    • https://nogojajefe.weebly.com/uploads/1/3/5/3/135314992/kirenifuxo_muvarenewivufa_fatapobute.pdfIn PDF document text
    • http://dajopot.22web.org/mizelexaxodexikusata.pdfIn PDF document text
    • https://rolewexuvuviwu.weebly.com/uploads/1/3/4/7/134742390/zesadaxe_weguwojega.pdfIn PDF document text
    • https://cdn.sqhk.co/lomokubaf/E0Aidxq/vocabulary_words_list.pdfIn PDF document text
    • https://cdn.sqhk.co/rupomotiz/lhe21jd/highwaymen_paintings_fort_pierce.pdfIn PDF document text
    • https://cdn.sqhk.co/vapatibu/bnjji1R/sojosopuguroneniwax.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tamefizorala.epizy.com/nowowuvamedeziredesu.pdfIn PDF document text
    • http://lazevemu.epizy.com/twilight_all_series.pdfIn PDF document text
    • http://betitunusepa.epizy.com/download_font_barcode417.pdfIn PDF document text
    • http://luzavevamafidix.epizy.com/mappa_aquileia.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EE 5260 bytes
SHA-256: 5eeef77f454712c5bf672888af145fddc91fea2c503fc3dad3682057b3696f56
font_01_sfnt_off000119bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BB 10856 bytes
SHA-256: 64e99b39c371b6f3a343d8faddfb0802f46c66ead75fdee6dd98be489a1bf924
font_02_sfnt_off00013ebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EBB 16828 bytes
SHA-256: dc61903c9573ec94408b1e6f60725f7abf9f3be9a1f3d582177726fd0ec3330f