Malicious PDF — malware analysis report

Static analysis result for SHA-256 44a33041cfe01993…

MALICIOUS

PDF

72.7 KB Created: 2021-03-22 07:42:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: a737bd5ab12d506164c496cb04e14eca SHA-1: a849191bb9437f4f47b50528b4b78022b67c6e30 SHA-256: 44a33041cfe019934a53b874c749be8d1ebc96ba3fbc4c1049d7bcd96e279c66
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains and link farms, strongly suggests a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains references to external URLs, reinforcing the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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://pelibifir.ru/strik?utm_term=how+to+adjust+a+manual+boost+controller PDF link annotation
    • https://cdn.sqhk.co/kafexobesa/hjGMVc3/88621737817.pdfIn PDF document text
    • http://islta.fun/probability_and_statistical_inference_10th_edition_free_downloadickh4.pdfIn PDF document text
    • http://puliliraforuwu.22web.org/brunel_university_email_format.pdfIn PDF document text
    • https://cdn.sqhk.co/xorilulog/xshihcI/63550555235.pdfIn PDF document text
    • http://seamanygau.best/jukigolumon988vo.pdfIn PDF document text
    • http://siwupezomejen.getenjoyment.net/libixedefofalav.pdfIn PDF document text
    • https://cdn.sqhk.co/bamebuxi/gWthfha/54083289610.pdfIn PDF document text
    • http://kumajamefe.getenjoyment.net/jowowetuloda.pdfIn PDF document text
    • http://shoop-fo.ru/gedezofewowaw366ht.pdfIn PDF document text
    • http://kemytbok.xyz/nukokafalisob6bqwf.pdfIn PDF document text
    • https://cdn.sqhk.co/foropogajag/yjga4id/92158519580.pdfIn PDF document text
    • http://arevakar-travel.com/givirupen4zwo.pdfIn PDF document text
    • http://dvestideyli.xyz/small_dutch_tool_chest_plansegj1b.pdfIn PDF document text
    • https://cdn.sqhk.co/zojoguxuban/jelheZw/heroes_magic_world_promo_code_ios.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/libosokune/60514862611.pdfIn PDF document text
    • http://kadoxosin.atwebpages.com/us_navy_uniform_regulations_boots.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/abba_top_songs.pdfIn PDF document text
    • http://zetesapoxus.epizy.com/peduduvumatokodomusa.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/jodajoma.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/meniduje.pdfIn PDF document text
    • http://vaveboxalubani.rf.gd/are_betty_crocker_brownies_dairy_free.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/safafebuxewon.pdfIn PDF document text
    • http://lisirowi.rf.gd/what_tool_do_you_use_to_measure_air_pressure.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_off0000e0a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A7 5356 bytes
SHA-256: 969a48ebac54cbd48624e0e27fe8065fbe4e69fbb8dee60fd480716f8813d0c9
font_01_sfnt_off0000f2d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D2 10120 bytes
SHA-256: d3cb620d269a812df5beefc0a39142877269eed171f2730276814f9075ad94dc

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