Malicious PDF — malware analysis report

Static analysis result for SHA-256 702df3925b99fe19…

MALICIOUS

PDF

90.7 KB Created: 2021-04-01 00:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: df8d838c63347a0ba22e7d9bec5863a6 SHA-1: b0ba1aa06717b07bbc67637fd262041b6e3961b6 SHA-256: 702df3925b99fe191bb3ecc01f6d1950b496ad7b49c28ef90f1531cc05146604
186 Risk Score

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://gimoguvi.ru/aws?utm_term=how+to+become.a+registered+nurse PDF link annotation
    • http://mipexalazalekab.getenjoyment.net/7_merveilles_du_monde_antique.pdfIn PDF document text
    • http://xeniveperovabef.sportsontheweb.net/cambridge_english_qualifications_pre_a1_starters.pdfIn PDF document text
    • http://wexakevo.22web.org/nudubuvatowotisop.pdfIn PDF document text
    • http://pemotutafid.mywebcommunity.org/34164967895.pdfIn PDF document text
    • http://ledukamu.iblogger.org/factors_affecting_soil_erosion_wikipedia.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c2dbac7f-2075-4dc1-ad03-af0d0352bff2.filesusr.com/ugd/278743_7d76c0beacfd4fb88f29edf5df97000d.pdf?index=trueIn PDF document text
    • http://zedofaxuboz.onlinewebshop.net/unique_and_repetitive_dna.pdfIn PDF document text
    • https://ed21222e-fee3-4fab-8b52-e2ddb7bb35ab.filesusr.com/ugd/e73fea_7a44e939573b4292bb2706ff65e88e68.pdf?index=trueIn PDF document text
    • http://semowomeso.onlinewebshop.net/6_week_workout_plan_to_get_ripped.pdfIn PDF document text
    • https://78ee58ad-4251-4cb6-9d9e-6f806931ac90.filesusr.com/ugd/b6b4e8_f01bc9f13a054aebbe320155b6643f1a.pdf?index=trueIn PDF document text
    • https://c46c713f-5e69-4c64-aad4-d86f29440f76.filesusr.com/ugd/957c7b_513f37feafc6468398467dad4017b584.pdf?index=trueIn PDF document text
    • https://68a74d12-89ac-4a94-b826-09ad332a30bf.filesusr.com/ugd/1a0392_46f67138f0c74f3789c66a5cff4976d2.pdf?index=trueIn PDF document text
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_2e49915293204358b4d580a540d2167f.pdf?index=trueIn PDF document text
    • https://83bd47e3-138d-48d8-8d00-514fe13b91b0.filesusr.com/ugd/c87a2f_ba5d5af42f264b3fa8d367d5d4723a0a.pdf?index=trueIn PDF document text
    • https://d90bda3b-35dd-409f-9d4b-b4a00d881a52.filesusr.com/ugd/b88e3d_9f50053d262c4c05a73b2e1d1350c28b.pdf?index=trueIn PDF document text
    • https://883cd1dc-02d0-4059-8fa2-99201f92b631.filesusr.com/ugd/6166c9_eb86e904e51d472b929b394ffc784dd8.pdf?index=trueIn PDF document text
    • http://daxepusiz.rf.gd/busuu_premium_apk_latest.pdfIn PDF document text
    • https://8f6f9f04-f977-4239-955d-f6aecf2dd879.filesusr.com/ugd/81cd61_22720df222d24520bcd9951ea6d6c657.pdf?index=trueIn PDF document text
    • https://203e7bc3-08d7-4ecc-a8df-f797e0d4a079.filesusr.com/ugd/d4579c_b130ff816baa4374b99f02a7ffd60550.pdf?index=trueIn PDF document text
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_735f70330a184d859726a5e92e58a231.pdf?index=trueIn PDF document text
    • https://a1d3e036-d9a1-4be1-9d2f-eedbb581cb22.filesusr.com/ugd/3ce946_61361692fade4c15bdcf1b607f1cac2a.pdf?index=trueIn PDF document text
    • http://mexefesu.epizy.com/23745848492.pdfIn PDF document text
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_583262a5abdd41ffab9eed1f52105a4b.pdf?index=trueIn PDF document text
    • https://e25b7b56-d8f7-44cb-9276-56428e53d1cc.filesusr.com/ugd/63f3e8_df2eadfe4e4f469584d585d5d8874813.pdf?index=trueIn PDF document text
    • http://wutodabegaf.epizy.com/sum_of_interior_angles_of_a_triangle_worksheet.pdfIn PDF document text
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_b86885fe52b74300812b9cd96cee0c36.pdf?index=trueIn 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_off00012568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12568 5452 bytes
SHA-256: af0c6bf2c602bde2d2689389d78cf98700f515e553862ba9ef6275b6107062ee
font_01_sfnt_off000137ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137EA 10956 bytes
SHA-256: cc4961b1f111e47ba4cc893b6a12ec832bf798ddc4261c2e6ae6f598f07d2618

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