Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e1371a2eb319c95…

MALICIOUS

PDF

83.7 KB Created: 2021-03-27 09:40:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8dfddeb446d321e50d0af3a9236419d SHA-1: 6485a08f125f6d4380e4b2bf16b77c4b1f755c7e SHA-256: 5e1371a2eb319c9525ba61f43aa69879e9d4a00164fe50820d34293f7dde3057
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 of which are dynamically generated and point to potentially malicious content, as indicated by the PDF_SEO_LINK_FARM heuristic and ClamAV detection. The embedded URLs and the ML classifier output strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/wix?keyword=bloons+tower+defense+5+walkthrough
    • http://xidotamasaw.22web.org/tabotavetafo.pdf
    • https://vituxusupodewe.weebly.com/uploads/1/3/1/3/131379836/9368544.pdf
    • http://pagavopalubutu.scienceontheweb.net/logitech_k800_keyboard_battery_replacement.pdf
    • http://wiwurike.iblogger.org/zunawilarelagurelepo.pdf
    • http://xojuxelase.medianewsonline.com/gevepezexi.pdf
    • http://smartycredit.info/9519446867zboio.pdf
    • https://mibirewisurux.weebly.com/uploads/1/3/5/3/135313447/bfdab910df8974b.pdf
    • https://kudowelevuk.weebly.com/uploads/1/3/4/5/134585456/8c3f004b.pdf
    • http://fejukoturig.medianewsonline.com/selalunevazavetapijar.pdf
    • http://menbp.online/asu_forensic_psychology_major_map1h8uk.pdf
    • http://medesutaduj.22web.org/fepamol.pdf
    • https://dubiroki.weebly.com/uploads/1/3/1/4/131483307/c416b29.pdf
    • http://ch-bewertung-2888.xyz/grade_11_biology_textbook_mcgraw_hill8p2y6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://rumawotipu.epizy.com/kindergarten_abc_worksheets.pdf
    • https://84d5b3ab-51dd-4312-87b7-51df18fb3b26.filesusr.com/ugd/9ea9b6_9bd5711f745040569a9511f7687d8b64.pdf?index=true
    • https://39c3e2ba-dcb8-4bc0-9ed7-0058f02c59d5.filesusr.com/ugd/fd4c29_c1c59d3f38ef4d1ebee92919cb192454.pdf?index=true
    • http://wexewowi.rf.gd/easy_soft_pastel_art_for_beginners.pdf
    • https://ee60c613-3dd1-430d-b711-08e3dcbf0273.filesusr.com/ugd/19ce5d_6034ee71cde747de84e9a69a971d9c4b.pdf?index=true
    • https://s3.amazonaws.com/tabobujimo/story_brush_slanted_font_free.pdf
    • http://lejiletuvasipib.onlinewebshop.net/plsticos_biodegradveis.pdf
    • https://s3.amazonaws.com/timituvupame/dipukalarimaporofotagon.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001097e.bin
8f58dc0741acde02835d367faa634eefbfd85abbaec080c2dc71b3010d3aaab0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1097E 5496 bytes
font_01_sfnt_off00011c4e.bin
bee7f7bf3c37cc1d5f2bbd1751e3b9db6e6112b5425e15fd52abdd5f494c1e37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4E 10928 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.