Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eb7c9bdee019dbd…

MALICIOUS

PDF

82.3 KB Created: 2021-04-01 04:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 352c04170a25712aa1acc05c3ee9cd3e SHA-1: 28e21de63f76ca6bf70e2db419a55300038e5447 SHA-256: 4eb7c9bdee019dbde8e42d17bcca1ded37daab7fe384f6030c811dd46ec35525
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a phishing lure, disguised as an 'event donation request letter'. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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/wix?keyword=event+donation+request+letter PDF link annotation
    • http://rent-nout.site/free_guided_meditation_for_sleep_appbf1oj.pdfIn PDF document text
    • https://cdn.sqhk.co/zowonefaso/icY1Nif/street_fighter_4_mod_apk_offline.pdfIn PDF document text
    • http://lorezagosuvese.scienceontheweb.net/83547630072.pdfIn PDF document text
    • https://cdn.sqhk.co/zarepowake/g9jdLje/79525718223.pdfIn PDF document text
    • https://bewirupudafa.weebly.com/uploads/1/3/1/6/131607000/5cf45e70.pdfIn PDF document text
    • http://losusosemusisi.iblogger.org/scratch_game_programming_for_young_adults.pdfIn PDF document text
    • http://zdsshop.top/emergency_medicine_pa_jobs_coloradotx6uv.pdfIn PDF document text
    • https://kadeborejegan.weebly.com/uploads/1/3/2/7/132740978/venarenaxonoxulirot.pdfIn PDF document text
    • https://cdn.sqhk.co/kosojilufut/givhgOd/food_truck_pup_cooking_chef_mod_apk_rexdl.pdfIn PDF document text
    • http://ar-foto.art/6312461892oprwj.pdfIn PDF document text
    • http://tofoxewesaxizuz.mywebcommunity.org/33515637165.pdfIn PDF document text
    • https://jubigugatuse.weebly.com/uploads/1/3/0/7/130775741/pikoxopon.pdfIn PDF document text
    • https://taxajoberaruvu.weebly.com/uploads/1/3/4/3/134320235/fogofagisewepogozeno.pdfIn PDF document text
    • https://radobejaka.weebly.com/uploads/1/3/5/4/135400195/tosobepo.pdfIn PDF document text
    • http://gaydating.world/53122199736q0b4i.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://de2ee6d5-caaa-4265-b15c-40100ab77d99.filesusr.com/ugd/d43733_9b0741b773a3485eb568f67e4cb54e01.pdf?index=trueIn PDF document text
    • https://c36efdde-2309-4ce2-a10d-b6df2ce12cd8.filesusr.com/ugd/e98059_19b1ab6b34334f009727315f2552d9aa.pdf?index=trueIn PDF document text
    • http://vuxifonodine.epizy.com/38610933263.pdfIn PDF document text
    • https://efa91360-7c21-416c-9d60-3189e0beb381.filesusr.com/ugd/42ffc7_0dbc6de76da4460ea527922cbe364260.pdf?index=trueIn PDF document text
    • http://dosidojabar.epizy.com/hyperkalemia_guidelines_cks.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_off000105d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D7 4960 bytes
SHA-256: 99ed66246fbec8f9c378aa3edef1c92b39084083dbbd84b247ce2793d4c2fa5d
font_01_sfnt_off000116ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CA 10532 bytes
SHA-256: b7d13e6a80483787a03be0741cf0fee59bb41d077020082065ba9212d994a588

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