Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e58a9ac89704a0f…

MALICIOUS

PDF

80.3 KB Created: 2021-03-10 11:44:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3823b03979f659cd85c14ae5c4ab7c71 SHA-1: 99798074d4232ff53bc73445a748ea61acab09ed SHA-256: 5e58a9ac89704a0f992b7739763f95d4df5ee2071061dfd02f07163fbcbffb53
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 6

  • 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 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://jacksth.ru/123?utm_term=website+builder+reviews+consumer+reports PDF link annotation
    • https://cdn.sqhk.co/fusaduxuw/jhaZQSP/21843013212.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482208/normal_6005639a5a862.pdfIn PDF document text
    • https://cdn.sqhk.co/temisexezoda/m2jegho/monster_hunter_rise_release_date_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452607/normal_5fd9e4964d782.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409992/normal_603d7127e3b6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491936/normal_5fd1147653e39.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463812/normal_6007d70f6912b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465012/normal_5fdf00a229277.pdfIn PDF document text
    • https://cdn.sqhk.co/tixukiko/jgLpmgF/85796216495.pdfIn PDF document text
    • https://cdn.sqhk.co/jekefebiba/jghhd25/somuvozidasetu.pdfIn PDF document text
    • https://cdn.sqhk.co/lajawawinu/aojh3ha/zemowozejabezived.pdfIn PDF document text
    • https://cdn.sqhk.co/lusoxepero/eJEhaih/dusttale_papyrus_roblox_id.pdfIn PDF document text
    • https://cdn.sqhk.co/tavevalurov/qhbiipl/hidden_escape_lost_temple_walkthrough_chapter_7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409797/normal_600be0cd73bae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368991/normal_602fff152a3b1.pdfIn PDF document text
    • https://cdn.sqhk.co/xogudililavo/dhjoDhf/bujugapozosema.pdfIn PDF document text
    • https://cdn.sqhk.co/dawolesirip/IehHZjj/free_slots_games_offline.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393759/normal_6038143542951.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_808328887c4a4fc38b54364e4464de46.pdf?index=trueIn PDF document text
    • https://8a5a474a-a671-4857-921d-d1df0ee72544.filesusr.com/ugd/523716_30b9593bcdb9441c874a8ac4b22aff52.pdf?index=trueIn PDF document text
    • http://dapukagizepor.rf.gd/xolese.pdfIn PDF document text
    • http://tuwesexo.epizy.com/finemoxosozox.pdfIn PDF document text
    • http://jorowiwiboxizuk.rf.gd/phonics_song_3_free.pdfIn PDF document text
    • http://jigigapapidafe.epizy.com/chadariya_song_mr_jatt.pdfIn PDF document text
    • https://dda5c79a-a75d-44d9-a006-48dec3bfe172.filesusr.com/ugd/115d6e_c5db8680040746578b76c9f1fa57c7fb.pdf?index=trueIn PDF document text
    • http://bexisojulodu.epizy.com/96150629728.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_off0000fa68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA68 5316 bytes
SHA-256: 91d680d8aa899ae8af8fd9e65d7f436ea338d5f00745ad7b4d81b4f2f5aa66e4
font_01_sfnt_off00010c74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C74 12252 bytes
SHA-256: 42f463cb341aaff229029f4c098faddf9de84ada67cdb2229469d262897cddc6

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