Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b207b915cd4200f…

MALICIOUS

PDF

76.9 KB Created: 2021-02-17 16:12:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 222dd61d6f2921671aa8c6fbc1081158 SHA-1: 5890f83741420dc303c46d00520ac2f8f7493b16 SHA-256: 7b207b915cd4200f5aa8e09927e4342440a3be5d230d341f281cf1faa43174ed
126 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to disposable domains or link farms, indicating a phishing or spamming campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the sheer volume of external links is a strong indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/123?utm_term=nikon+d3500+dslr+camera+review PDF link annotation
    • https://joxunirefebemi.weebly.com/uploads/1/3/4/3/134319414/zanarukonebotamajegi.pdfIn PDF document text
    • http://fortuneocredit.com/moradigonebobagefijonebn43j3.pdfIn PDF document text
    • https://cdn.sqhk.co/mapelimujeku/chatY2A/26847956978.pdfIn PDF document text
    • http://wawimetuboze.iblogger.org/buxobax.pdfIn PDF document text
    • https://cdn.sqhk.co/kelopifagisu/gjghCjb/beguvevuvebesekogufotepi.pdfIn PDF document text
    • http://closemaze.com/halloween_dance_party_invitationsy3l8l.pdfIn PDF document text
    • http://pogofefopi.22web.org/ruzanibenogejer.pdfIn PDF document text
    • http://abistrans.ru/disgaea_2_perfect_character_guide73mab.pdfIn PDF document text
    • https://cdn.sqhk.co/negapevu/i6KHsFu/flying_monkey_costume_baby.pdfIn PDF document text
    • https://debimagobu.weebly.com/uploads/1/3/1/6/131637583/edfaf648.pdfIn PDF document text
    • https://gufiferufa.weebly.com/uploads/1/3/2/3/132302963/5261302.pdfIn PDF document text
    • http://alex-chekalev.com/book_review_born_a_crime_trevor_noah2swyu.pdfIn PDF document text
    • http://straponartist.com/93441175148e39x3.pdfIn PDF document text
    • http://trening-ekaterinodar.ru/66895552876k7dz9.pdfIn PDF document text
    • http://lg-supportteam.com/stoney_s_restaurant_danville_illinoiszo633.pdfIn PDF document text
    • https://pilidikuvitas.weebly.com/uploads/1/3/4/7/134766888/1320b8.pdfIn PDF document text
    • http://study-english-05.site/import_platform_react_nativeui9ir.pdfIn PDF document text
    • https://cdn.sqhk.co/duxadikoti/duhhWS1/never_alone_apk_obb_download.pdfIn PDF document text
    • https://bagetakibejo.weebly.com/uploads/1/3/1/8/131871627/6276945.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://miwafugupek.epizy.com/tamil_movie_isaimini_2019_hd.pdfIn PDF document text
    • http://xumutopefar.rf.gd/vupedonulixadifasimi.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB8 5700 bytes
SHA-256: 0004ba3aaea1c142cc7ea6ef352f3fae7ab205da78dae2a68420153fb23d1593
font_01_sfnt_off0001032b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032B 10196 bytes
SHA-256: 4d5f9bb16ef246373ee8fe4bbf571c88fee824a29acb582d937a7b8b2683470d

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