Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3ebf60210b09fcb…

MALICIOUS

PDF

71.1 KB Created: 2021-03-25 14:07:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14023b6b431e679d3abcc6e812813662 SHA-1: d0bd5813d19000e25652d0b75e38e5b1ec398eaa SHA-256: a3ebf60210b09fcbf7be91eff8fbe4b0bbf1e53ef8ba1602f2777a3f0feff693
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL suggesting a phishing or SEO spam tactic related to "module 7 math test answers". The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/wix?keyword=module+7+math+test+answers
    • http://pochta-24.cc/airthings_wave_review46f18.pdf
    • https://sojuseruk.weebly.com/uploads/1/3/4/3/134367588/pefikip.pdf
    • https://xokumosub.weebly.com/uploads/1/3/1/4/131408432/nokilenagi.pdf
    • https://gikeviviku.weebly.com/uploads/1/3/4/7/134707445/wawux.pdf
    • https://pudawiwut.weebly.com/uploads/1/3/5/3/135342926/wonipe-ledulex-lugijutu.pdf
    • https://vunozeguwogiwe.weebly.com/uploads/1/3/4/7/134745761/wufelivuze_bixodugi_piwanekalogexel.pdf
    • https://tapukinag.weebly.com/uploads/1/3/1/6/131606864/4d0401846e5752a.pdf
    • https://pekiwuvigefarov.weebly.com/uploads/1/3/4/7/134766825/53b739f0c.pdf
    • https://miwevedadig.weebly.com/uploads/1/3/1/4/131437981/4800547.pdf
    • https://devegiwosoti.weebly.com/uploads/1/3/4/5/134592662/jenujekesesaz_nisana_kusawilogadu.pdf
    • http://btsworld.org/sanowesokuzejonabawufunokdrbzl.pdf
    • http://yandex-dostav.ru/vajebojigigatajigutefowahsj38.pdf
    • http://carins.info/54715701127h04x4.pdf
    • https://fitinunajixir.weebly.com/uploads/1/3/1/6/131637477/nexati.pdf
    • http://cybety.xyz/what_food_goes_well_with_a_riojad5dfs.pdf
    • https://sukurexu.weebly.com/uploads/1/3/0/9/130969838/39f7fdfeaf9b.pdf
    • https://bekodezu.weebly.com/uploads/1/3/1/8/131856725/zupod.pdf
    • https://ligofaxudatejot.weebly.com/uploads/1/3/0/7/130739538/fufiputijimofasusa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bodajaku/hp_2013_ultraslim_docking_station_firmware_2.30_download.pdf
    • https://s3.amazonaws.com/lorugipopuxe/simpsons_hit_and_run_speedrun_guide.pdf
    • https://s3.amazonaws.com/petuzutemixuvod/elise_guide_pro.pdf
    • https://s3.amazonaws.com/gifiz/99612073810.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_off0000da6b.bin
4f116009d8e4e1bdeecbcca3a8499b814bf903f2bbe1b72a5c4aa7688fa0b3b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6B 5240 bytes
font_01_sfnt_off0000ec2e.bin
8369899862b146a0eeadf9fc013edfcac36a472d2d853dd2998d3c1e2b77ba7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2E 10272 bytes

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