Malicious PDF — malware analysis report

Static analysis result for SHA-256 386f2b2061d574d9…

MALICIOUS

PDF

78.6 KB Created: 2021-03-18 09:32:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d8e8cd88380a4973eb6796c352caa34d SHA-1: ec95a43594bc91448afee1c12e512f0c0bca8045 SHA-256: 386f2b2061d574d9d93321beacf13398235f51faf851ac7810391e025aa09f2c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9993

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://golowaki.ru/wix?keyword=constitution+worksheet+high+school PDF link annotation
    • http://kelnoteres.xyz/90817101221r9g8x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495684/normal_5fe85297a8023.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387562/normal_602e7f9a81fe6.pdfIn PDF document text
    • https://cdn.sqhk.co/litalile/fMZjies/31760592120.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471704/normal_5fca379034a83.pdfIn PDF document text
    • http://kukushka.space/piggy_book_2_roblox_release_daten8o42.pdfIn PDF document text
    • https://cdn.sqhk.co/wovenebi/dibMjiX/loopnet_california_apartments.pdfIn PDF document text
    • http://naturaitalia.space/remizerobuvufomikomikofi83g.pdfIn PDF document text
    • https://cdn.sqhk.co/marivefigus/JibgjLJ/medtronic_peripheral_guidewires.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475406/normal_601e68d02900a.pdfIn PDF document text
    • http://shtangennstutkupitseychas.xyz/what_does_it_mean_when_the_birds_are_chirping9jl9x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372384/normal_6052b96eb081f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382208/normal_60010ef0a7b29.pdfIn PDF document text
    • https://cdn.sqhk.co/mapetidul/aihTHha/lineage_of_jesus_from_david.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376087/normal_603d389722ed0.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/1746161c-729f-4c57-a9dc-bef92bcda7f7/dukake.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d639f96d-2cd7-4eec-8190-c8ec4d059712/netgear_powerline_1200_ethernet_not_working.pdfIn PDF document text
    • https://8d9f32f1-468a-4e6e-8fd0-236262902e57.filesusr.com/ugd/28860c_d8d9c20a5598448c8ff62ec6c3b29195.pdf?index=trueIn PDF document text
    • https://0e8f88b9-656e-4b05-9cd8-8bd477f85547.filesusr.com/ugd/95b9ea_436fc0226f3549dbaf33393b73940980.pdf?index=trueIn PDF document text
    • https://43fe4710-460a-4ad3-90dc-2dd795c51528.filesusr.com/ugd/a32c20_af6eab683f8a4e7f8d2b4740ed68b66c.pdf?index=trueIn PDF document text
    • https://f9c81679-ddb1-4746-ab40-32673edc426c.filesusr.com/ugd/2eff39_e7ee8dea3ddf471298fb9eb801a0b998.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd388d9e-520e-4922-ad85-2f37dfd42a7e/7509528885.pdfIn PDF document text
    • https://9ebe8999-295a-4f11-87dc-c96f3e1b46ff.filesusr.com/ugd/8de238_5e899a5fc3544063a3b20c7ee2e01370.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6ee6c73-dab6-4ad2-8f25-1c7776ca69b0/the_night_before_christmas_oversized_padded_board_book_the_classic_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c8b3ff5-543d-48e0-b9cc-3484753ee9ef/fanirasit.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_off0000f745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF745 4912 bytes
SHA-256: 24601ded4732dc6c3fd2fac886cc01c0aa75454f51d397238e816faeffb06e3d
font_01_sfnt_off0001080c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080C 10820 bytes
SHA-256: 69c80608e9028ee9a103a82dc37ccbf581530e1c6681afa9ae47fbc97b7e98aa