Malicious PDF — malware analysis report

Static analysis result for SHA-256 18a3ea11bea98249…

MALICIOUS

PDF

75.0 KB Created: 2021-02-23 12:14:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e9dd20ae381aa7318df17a83c4115f82 SHA-1: 2221147b121ec7e5e502fdc9ea200a9bb4bf3a60 SHA-256: 18a3ea11bea9824922c82c036290e3b6bbef9d730c7bb43bb0b10f6813d7c6c7
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains a question about LG TV flickering, which is likely a lure to direct users to the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/strik?utm_term=why+does+my+lg+tv+keep+flickering PDF link annotation
    • https://cdn.sqhk.co/kamozipu/bTEhmz1/modiwuj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493578/normal_5fc607c6edb16.pdfIn PDF document text
    • https://lisiruzefixa.weebly.com/uploads/1/3/4/4/134495270/mutomolunemurevomu.pdfIn PDF document text
    • https://cdn.sqhk.co/vejuwozigef/c9jfLic/2pac_changes_lyrics_download_mp3.pdfIn PDF document text
    • https://cdn.sqhk.co/zapiferufefu/hhXNhjl/73082599669.pdfIn PDF document text
    • https://jodisugej.weebly.com/uploads/1/3/4/7/134732418/tinofatiz_pebanotanapurof_kipezopujujukid_jedijivitu.pdfIn PDF document text
    • https://cdn.sqhk.co/movumatoz/k6NPii1/43621708851.pdfIn PDF document text
    • https://zomutelisofo.weebly.com/uploads/1/3/4/7/134712892/270d9f358a0.pdfIn PDF document text
    • http://janurikemodowu.iblogger.org/43238943711.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://suxukapuvajobe.epizy.com/what_is_1-3-1_zone_defense.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/buxetidel.pdfIn PDF document text
    • http://niginikixino.epizy.com/how_to_turn_on_bluetooth_in_hp_probook_4430s.pdfIn PDF document text
    • http://posidepixofonep.epizy.com/rf263beaesr_ice_maker_problems.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_off0000e77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77A 5596 bytes
SHA-256: 0b6cc415c92551a41414042d3521840fe75ef79232137d6c31da1b1d1f24d2b0
font_01_sfnt_off0000fa7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7C 10612 bytes
SHA-256: 46c859a5320a15f674e7fafba5726302cb82a019779bec83dc4b31518957282d

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