Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f6081af69a4b76f…

MALICIOUS

PDF

76.9 KB Created: 2021-04-01 15:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ce3ba89228d0cd427022873e4d03fa7e SHA-1: caba22f89ab6dc9fb3b2a30ffd1b9b6e70e8929a SHA-256: 8f6081af69a4b76f303b4fba7e90321ff967abc794cef74c6cb010251aeaf20f
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs, with at least one identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing sites or download further malware. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, but the primary malicious functionality appears to be the embedded links.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=mass+effect+andromeda+prima+guide+pdf In PDF document text
    • https://roxowuvunesoneb.weebly.com/uploads/1/3/4/8/134889799/tanomitalibupojo.pdfIn PDF document text
    • https://sokefumupuzezu.weebly.com/uploads/1/3/5/9/135991751/43b2a4.pdfIn PDF document text
    • http://magic-world.site/world_war_z_game_steam_charts1bh9v.pdfIn PDF document text
    • https://rojurunonujimos.weebly.com/uploads/1/3/5/3/135325454/davemakexofeb_gitewib_tibubuxizipim_denarozapurak.pdfIn PDF document text
    • http://betmoy57.com/92054010967ti7v6.pdfIn PDF document text
    • http://ecoservice-vlad.ru/narokagokowifaglpnbi.pdfIn PDF document text
    • https://govuxedosuwiwur.weebly.com/uploads/1/3/5/9/135962540/4068344.pdfIn PDF document text
    • http://rmk4sale.xyz/gamedesign_grow_cube20hsy.pdfIn PDF document text
    • http://macsk.space/western_saddle_fitting_guideplnz7.pdfIn PDF document text
    • http://rabota-plus.club/683448654091dxge.pdfIn PDF document text
    • http://yewes.fun/expert_card_technique_espaolhqwdb.pdfIn PDF document text
    • http://theboldpantsproject.com/xozejepoxujuxzlgq.pdfIn PDF document text
    • http://blue-tick-central.com/fefefedijokibmbdl.pdfIn PDF document text
    • http://socialwave.me/radio_flyer_wagon_vintageh9sdi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6f95ace-af0b-4a99-b3a3-77ded439a66e/how_to_write_science_fiction_short_story.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/diabetes_mellitus_guidelines_australia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea385f06-bb36-43db-ad05-9c7f05eb4527/17595727479.pdfIn PDF document text
    • http://wufikemofumop.atwebpages.com/jopiwojuzuxabaludoxij.pdfIn PDF document text
    • http://pojoviraxerojo.myartsonline.com/little_scholastic_my_favorite_pets.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/takijovelomiduvaxogixitaf.pdfIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/how_to_tell_valuable_marbles.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_off0000ea56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA56 5448 bytes
SHA-256: 6523d1d54900fee663bb322784626a0268c57d31dabd53d06dcfc9fd721ccc17
font_01_sfnt_off0000fcd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD7 12156 bytes
SHA-256: 832f999931e648cb525a031d4f86e9eb28ca269c90c47f124a5dcba60fbebeff

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