Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcb82a90f2c3c724…

MALICIOUS

PDF

71.9 KB Created: 2021-04-06 03:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15993d031605da11fc433b5500ca30b0 SHA-1: dbc94d3c5cc35414933e01c78af58f458b032017 SHA-256: dcb82a90f2c3c72402c22af903a60ffb37354546ece906f83c5dfdb6c11ddde9
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs, suggesting a link farm or a method to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity, potentially leveraging embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://midufefew.ru/award?keyword=mahalaxmi+calendar+august+2020+marathi+pdf
    • http://rabatil.22web.org/julejebisiwenu.pdf
    • https://kelebewo.weebly.com/uploads/1/3/4/3/134359650/laruganepoz.pdf
    • https://tenubufaz.weebly.com/uploads/1/3/1/1/131164261/527461cef9b.pdf
    • https://nipoxumafoji.weebly.com/uploads/1/3/4/7/134717148/b4e9363d7.pdf
    • https://cdn.sqhk.co/guwuweri/hfwgeLB/alarm_clock_app_for_pc.pdf
    • https://pisekubil.weebly.com/uploads/1/3/4/3/134322001/7295519.pdf
    • http://potasofan.iblogger.org/slingbox_m2_xfinity_x1_setup.pdf
    • https://nimijakis.weebly.com/uploads/1/3/4/5/134577625/4668547.pdf
    • https://bozobazevadetob.weebly.com/uploads/1/3/1/6/131607158/simoleme_dewula_kigomagazituzu_kofusipove.pdf
    • https://kasozufadoji.weebly.com/uploads/1/3/4/5/134523760/gufalazitasipot.pdf
    • https://bufagigakumeg.weebly.com/uploads/1/3/4/3/134313452/buxewegegabupujanu.pdf
    • https://vulemozebo.weebly.com/uploads/1/3/4/6/134693025/wonaxapubu.pdf
    • https://cdn.sqhk.co/lawafopugu/UC4vkWs/23333283949.pdf
    • https://xubidanata.weebly.com/uploads/1/3/4/8/134895671/zuroj.pdf
    • https://cdn.sqhk.co/vibisidumes/hifvmid/survival_island_2_dino_hunter.pdf
    • https://cdn.sqhk.co/xupodafib/cihSEgi/ravens_covid_update.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://rigutogivopum.epizy.com/play_store_app_install_old.pdf
    • https://uploads.strikinglycdn.com/files/5eb77f19-3879-4db6-8f07-a9b7e516f716/hp_photosmart_2610_fax_instructions.pdf
    • https://uploads.strikinglycdn.com/files/3935940a-902c-44da-afd3-7c80269b6819/the_plant_based_meal_plan.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce28.bin
faeca155fd7aff1670a99f188dc36da9bab900f9b5ab8de26e0f4fcd6ef4c2da		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE28 5688 bytes
font_01_sfnt_off0000e15d.bin
d8b91063bab2f29e9994f4a9c6a3cf4d7937540b8e80d99e435add27eab54e67		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE15D 10132 bytes
font_02_sfnt_off00010401.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10401 4324 bytes

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