Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c191c9cfd30dd39…

MALICIOUS

PDF

77.7 KB Created: 2021-03-14 00:28:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ca9f1697df2385c6b0525848d9c49821 SHA-1: b8d34cbf3c1e906ea132565c666485b64024112b SHA-256: 1c191c9cfd30dd3925451762f3414f27be311d0b78126f3f209c19269e251f73
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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=alternation+of+generation+in+gymnosperms+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4423750/normal_6017b629be84b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415936/normal_5fdfd67324fe7.pdfIn PDF document text
    • https://cdn.sqhk.co/wafavalufa/piiJ1ij/don_t_rush_challenge_tiktok.pdfIn PDF document text
    • https://cdn.sqhk.co/zunezafi/iNjiJii/tap_shots_kizi.pdfIn PDF document text
    • https://cdn.sqhk.co/takejirasomu/ii5ghha/farming_simulator_14_apk_free_download_for_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448740/normal_6031dc08ebe98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494883/normal_60275e06f2bb7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496225/normal_5fdd022040244.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426955/normal_602de6964af6d.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/remeranexe/how_well_can_you_follow_directions_the_united_states_of_america_answer.pdfIn PDF document text
    • https://75a697d3-84f0-44cf-bab9-f05e37020c50.filesusr.com/ugd/7c3584_0d4c4990128040029c4418dcf29f9d7f.pdf?index=trueIn PDF document text
    • https://aca292c6-a3ee-4c96-b4c9-db15c8eca1b9.filesusr.com/ugd/cd1d52_a7a972e7f6bc44f68423417a76a0d170.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2d265dd-a933-417e-bd2b-13ea1a410620/vulogudidazogo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c187fa81-c8e1-401a-bb45-3abf851be17b/3983026349.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efee40f2-21df-4996-8df2-40ad3f25cc46/doctor_of_philosophy_in_education_jobs.pdfIn PDF document text
    • https://089130c0-62ae-4bf1-a93c-656440fe8451.filesusr.com/ugd/738632_c6396cf6c29a486b94e200549e761f5f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/617f49e3-3860-413b-b7f5-6dcdc5c3fae7/20782867592.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/43883030923.pdfIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/no_drama_discipline_book.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_off0000f143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF143 5452 bytes
SHA-256: 98563e73c224c6b46bb4e38468c4724477dca0d466c04f0194c76e6a31b761fd
font_01_sfnt_off000103c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C5 10492 bytes
SHA-256: d16ae65df528b1376bc830736495f123b7250b2348d32829ba167d55501e3acc

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