Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f251f46aec3c1ec…

MALICIOUS

PDF

78.3 KB Created: 2021-04-05 03:24:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 03c7f263e68c573b59f15e07f1026d74 SHA-1: 18fb8df3a5a1ad7fcb0e5312b114b4ed7ad0fd7e SHA-256: 8f251f46aec3c1ec8da2e8ea9797b9bf8761645121f4afbedb90a44542f9acdd
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to a site offering a 'free pdf' download, indicating a lure for users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farm heuristics further supports the malicious nature of this document.

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://jacksth.ru/award?keyword=sylvia+day+afterburn+free+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4474979/normal_5fe80796a8c01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450160/normal_60499b934eb3d.pdfIn PDF document text
    • http://ramifapufebi.scienceontheweb.net/asuhan_keperawatan_anak_dengan_pneumonia.pdfIn PDF document text
    • https://cdn.sqhk.co/wametofenuwo/shh5hc9/guwojutiwi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485568/normal_5fc749da3e3ff.pdfIn PDF document text
    • http://fobegoruf.iblogger.org/states_of_matter_chemistry.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495241/normal_601ac2377fb36.pdfIn PDF document text
    • https://cdn.sqhk.co/jurugaguvedu/BR5y7ic/ding_dong_ravers_gweh.pdfIn PDF document text
    • http://kawafopi.mygamesonline.org/antenna_introduction.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/south_african_history_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9706e50-325c-441e-b070-9cd67636cc2e/percy_jackson_1_book_review.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/34355601846.pdfIn PDF document text
    • http://ruwozubusa.epizy.com/82256926658.pdfIn PDF document text
    • http://todosix.epizy.com/antiprotozoal_drugs.pdfIn PDF document text
    • http://sipikoz.epizy.com/pijetofujirusexogipakal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdb7ce91-b521-4f43-8f43-d5ba7fd06029/54886385498.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a772199-7462-48ab-b502-59a370ecc36e/lakewojiror.pdfIn PDF document text
    • https://s3.amazonaws.com/xujitezu/ben_franklin_bridge_traffic_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f964f1a8-ca50-4d29-bba5-eeb2ff19b96f/wodibiwigozodinanajanozi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad134329-0dcf-4797-9e6b-edddc6093406/garebixumanebiwujonexemu.pdfIn PDF document text
    • http://jalafugidovi.epizy.com/kingdom_two_crowns_island_3_guide.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_off0000f4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C6 5260 bytes
SHA-256: 64a7b20cdffee8606a2e877b5c99d5542182fe58af757fc25dbecd5bf7e8d7ea
font_01_sfnt_off000106c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C8 10976 bytes
SHA-256: a69cc16bd57160eef6d2d629d665aca05bfcc3660d2e0611e95a1727592beee7

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