Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d66a005d9955c38…

MALICIOUS

PDF

76.5 KB Created: 2021-02-26 13:41:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6346401bdf061a36e9387fde74393ef0 SHA-1: 07cd6aef2c9b008f186d454c598043e14073d894 SHA-256: 6d66a005d9955c386b29a3b3b29a7a611d838928c1c7b419da3d73e6811e0df1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, many pointing to disposable hosting and employing UTM parameters, which is characteristic of link farms used for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself facilitates redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=what+is+the+definition+of+the+word+workout PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408582/normal_6024af9e4e8e3.pdfIn PDF document text
    • https://cdn.sqhk.co/jirudumom/8Ejhwku/rojemesaxurunosimi.pdfIn PDF document text
    • https://kukezedom.weebly.com/uploads/1/3/4/6/134629177/185709.pdfIn PDF document text
    • https://guxofavopadowan.weebly.com/uploads/1/3/5/9/135988616/585bf062fc470.pdfIn PDF document text
    • http://gipilunafa.iblogger.org/is_marlin_good.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483365/normal_600708e8b3edf.pdfIn PDF document text
    • http://ripuxojelirul.iblogger.org/nejupuke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478961/normal_60195e0487ef1.pdfIn PDF document text
    • https://cdn.sqhk.co/ninivaxibab/Xvpidij/tubemate_for_windows.pdfIn PDF document text
    • http://bimojulumefa.iblogger.org/how_to_make_a_bird_in_the_game_little_alchemy.pdfIn PDF document text
    • https://vifawadezak.weebly.com/uploads/1/3/4/8/134846548/ravob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366993/normal_602b24bd75369.pdfIn PDF document text
    • http://kixumitusomu.iblogger.org/dogasepozujuxika.pdfIn PDF document text
    • https://cdn.sqhk.co/putuziboki/gCKREW1/real_police_car_driving_simulator_2020_car_games.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ledojefuvase.rf.gd/idrivesafely_final_exam_answers_2019_virginia.pdfIn PDF document text
    • http://wofofuzumoju.rf.gd/riwulimakex.pdfIn PDF document text
    • http://mujusitajal.rf.gd/loch_awe_fishing_reports_2018.pdfIn PDF document text
    • http://jimanujomubil.epizy.com/aafp_isfm_feline_friendly_handling_guidelines.pdfIn PDF document text
    • http://xeziribosivamis.epizy.com/lonenejexirumonegibeno.pdfIn PDF document text
    • http://lakugakukilub.rf.gd/brazil_football_song.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED63 5132 bytes
SHA-256: 7ed7ebf850497ec844c3cea5c416794f58114f97f4da1748da7e25eab91cb771
font_01_sfnt_off0000fef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF0 10956 bytes
SHA-256: ece017b92502a486c9f9f62aa45fe152071c7b814b82ec49d90ab050f29debc8

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