Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4db735cc57a2efb…

MALICIOUS

PDF

88.9 KB Created: 2021-04-08 04:57:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 8bf8af2e6dd25df0a3640ae63710dcd1 SHA-1: b1145c367b6900d3733ceaa9dceb5fe18885e5ac SHA-256: a4db735cc57a2efb6c7b14e4df2d7525e49c1e9f70d60f5b683695c07477b58a
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 0.9993

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://ponafet.ru/wix?keyword=business+organization+review+worksheet PDF link annotation
    • http://securityverifiedservices.com/pollo_enchilado_frito60fzh.pdfIn PDF document text
    • http://nuveclovet.xyz/zavujy22if.pdfIn PDF document text
    • http://koxelovanalimu.getenjoyment.net/what_are_the_7_core_values_of_community_psychology.pdfIn PDF document text
    • http://mateguwokalidub.getenjoyment.net/4593547057.pdfIn PDF document text
    • https://cdn.sqhk.co/rodoruwuwab/MSjcKhd/jotaro_s_theme_piano_sheet_music.pdfIn PDF document text
    • http://gefosezidubajoz.scienceontheweb.net/94193592198.pdfIn PDF document text
    • http://jujovobima.getenjoyment.net/bhagavad_gita_marathi.pdfIn PDF document text
    • https://cdn.sqhk.co/pumopivosoba/MijjcUa/26084620468.pdfIn PDF document text
    • http://rafupofamurawaf.mygamesonline.org/buzefufugonoje.pdfIn PDF document text
    • http://fopokigife.mywebcommunity.org/is_autocad_mobile_free.pdfIn PDF document text
    • http://betmoy57.com/27744272655oy9l9.pdfIn PDF document text
    • http://italiabeach.space/dungeons_and_dragons_sword_coast_adventurers_guide3brnp.pdfIn PDF document text
    • http://luminar4-download.xyz/anandam_telugu_full_movie_free_mp4tywlc.pdfIn PDF document text
    • http://pedugubugof.mywebcommunity.org/herniated_disc_physical_therapy_protocol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4095172d-bd2f-4181-91d7-dd424e653400.filesusr.com/ugd/df73ab_44c55c0121ba4374a8689228c255765a.pdf?index=trueIn PDF document text
    • http://xezaretidatoro.onlinewebshop.net/algebra_lineal_schaum_gratis.pdfIn PDF document text
    • https://746420f6-3007-491b-ba72-fd43be5094e5.filesusr.com/ugd/277b62_71109451e89e4311beaa9c0aa987f61b.pdf?index=trueIn PDF document text
    • https://22520ec4-2132-45a5-98b8-54db1b71d3ea.filesusr.com/ugd/b33b96_12b43cf2752b4f829ba14b757e1ada6d.pdf?index=trueIn PDF document text
    • https://510adc33-753b-44c0-977e-8d34da8fcdd4.filesusr.com/ugd/5f4192_1198d4308060410e81dc76220c4ab393.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa64f104-6ed0-4122-a84c-7a52d04250db/what_is_the_meaning_of_the_song_yankee_doodle.pdfIn PDF document text
    • https://9eaa565e-fb97-40b4-b096-d6760803f699.filesusr.com/ugd/55e2c6_85d99e59fd3c44958a7694695358a86d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6722121-77d7-4807-a95b-c098c2085b56/how_much_should_a_new_furnace_cost.pdfIn PDF document text
    • http://kofaxafogi.myartsonline.com/broom_2020_effective_public_relations.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_off00011d67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D67 5228 bytes
SHA-256: 57ade081961eb828722d0ab86ca9aac330e1fbc8dfd5e32e85adf7acfb66407f
font_01_sfnt_off00012f4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4D 11280 bytes
SHA-256: fa06ee89044650e84693c4251269316772c513875ee721219b95ec3e1478ae1e

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