Malicious PDF — malware analysis report

Static analysis result for SHA-256 35ec0930341e778d…

MALICIOUS

PDF

71.1 KB Created: 2021-01-25 09:28:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 240bb2602e541fe3f95283b3f274a75a SHA-1: 3cce2b0c5d7db45f191044622693c4401a58603d SHA-256: 35ec0930341e778d3fe2074400faeedd7b21db9ca70ce5d08a7658d57428f7d0
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains text related to 'st charles weather', suggesting a lure to entice users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://druttle.ru/123?utm_term=st+charles+weather PDF link annotation
    • http://arnautmebel.ru/punexifosusosuxegisbgi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424013/normal_5fdf349a041f3.pdfIn PDF document text
    • http://phtech.site/tutaxemutitikugy960s.pdfIn PDF document text
    • http://dezlice.ru/running_princess_2_game_play_onlineytja5.pdfIn PDF document text
    • http://faceskinagainbeauty.xyz/jijubugomadupekoxigaz3lwd.pdfIn PDF document text
    • http://2gusevshop.space/60637094689k931q.pdfIn PDF document text
    • http://idealicaitaly-ufficiale.site/wevixafasebo3l50r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468253/normal_5fd162a6c8537.pdfIn PDF document text
    • http://dorightschool.com/46897615386kz4gm.pdfIn PDF document text
    • http://spindlndou.space/845998474634ehqw.pdfIn PDF document text
    • http://giveaway2020.info/47014386180oecwo.pdfIn PDF document text
    • http://jewlgems.com/gamergreen_player_carddai2p.pdfIn PDF document text
    • http://ueuniti.website/free_american_dating_site_without_payment88gqh.pdfIn PDF document text
    • https://cdn.sqhk.co/jiguluzufuwa/gWgijfz/acs_chemistry_study_guide.pdfIn PDF document text
    • http://swiss-gear-top.xyz/38469135431eba6.pdfIn PDF document text
    • http://design-kvartira.info/save_earth_2020u8m92.pdfIn PDF document text
    • http://kpovli.ru/41830142583hy68v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379612/normal_5fda1130f33fe.pdfIn PDF document text
    • http://rezonansmusic.com/guess_telugu_movie_titles_whatsapphgvrd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000dadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADD 5080 bytes
SHA-256: 0c6d9dacda317f0f398d4ba82fd30c6c3b456f1a815ff78db5070d0a9acd1088
font_01_sfnt_off0000ec2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2A 10260 bytes
SHA-256: 5ecf6a5d82126eee2597450adff8446dbf7a023da24a39a6fb49a154e167b096

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