Malicious PDF — malware analysis report

Static analysis result for SHA-256 81da6a93a78cb6b2…

MALICIOUS

PDF

86.9 KB Created: 2021-03-25 04:47:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7970243afe53df5ff015f0b9d17ecc09 SHA-1: c62a6cebcde0c0de24e57941591c8ca7832b67bd SHA-256: 81da6a93a78cb6b246060e39a8742c310c605db957c57e725e4df760d6c48061
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 0.9983

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://zajinet.ru/wix?keyword=progrid+guide+8 PDF link annotation
    • http://kusufuxufatup.getenjoyment.net/translating_mathematical_phrases_to_algebraic_expressions_worksheet.pdfIn PDF document text
    • http://suzamajotibe.mywebcommunity.org/fertilizacion_del_cultivo_de_pia.pdfIn PDF document text
    • https://cdn.sqhk.co/mitebosareki/52gjzRp/nekofibavosul.pdfIn PDF document text
    • https://cdn.sqhk.co/pojuzijix/bjdhijj/sw_sound_words.pdfIn PDF document text
    • https://cdn.sqhk.co/vujenibolo/bhi2Phb/barbie_magical_fashion_mod_apk_revdl.pdfIn PDF document text
    • https://cdn.sqhk.co/xedufoga/vhaDgdq/planetside_2_ps4_server_unavailable_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/xagaxubibiz/bRbghRN/zotosubajesitudivopum.pdfIn PDF document text
    • https://ca-cdn.runningroom.com/pub/medIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fizojigijuzad.epizy.com/american_history_books.pdfIn PDF document text
    • http://zirutabu.myartsonline.com/how_much_money_has_star_wars_galaxy_of_heroes_made.pdfIn PDF document text
    • http://mugavividuroka.rf.gd/goluduluwitujedasewim.pdfIn PDF document text
    • https://s3.amazonaws.com/mejobu/42550212253.pdfIn PDF document text
    • https://676a7a22-5bec-432e-92e0-9d4a0a27851c.filesusr.com/ugd/a1fb72_36989dd5661c4a4e95e8aa26b45ea7b5.pdf?index=trueIn PDF document text
    • http://tivemuga.rf.gd/knight_age_leveling_guide.pdfIn PDF document text
    • http://mevexunimapo.epizy.com/70631147882.pdfIn PDF document text
    • https://s3.amazonaws.com/tufujifinobiro/what_is_unanimous_consent_agreement_in_senate.pdfIn PDF document text
    • https://73c25812-7308-4b32-b985-10e2a25710ca.filesusr.com/ugd/5b604d_ae7ac8a3cb5e4df4849761e721131972.pdf?index=trueIn PDF document text
    • https://d926c97b-7f3b-4ec8-a52a-318bcb589338.filesusr.com/ugd/120f26_0003c8ab1ca24383984f92d9b6e9b820.pdf?index=trueIn PDF document text
    • https://c2c662fa-00ac-4c69-bf5d-04da7d6c99e2.filesusr.com/ugd/9b33c5_3fb2472ba77d4fdc9106ff2e908b34b1.pdf?index=trueIn PDF document text
    • https://74df6fe0-557b-4e47-8461-f2df536053d0.filesusr.com/ugd/4dcf4e_e8220d6452d24a20a014d20025c0af70.pdf?index=trueIn PDF document text
    • https://f579be4a-c2ec-451d-94ee-532237c06880.filesusr.com/ugd/9f6a24_29a7e997db3444a4bf9f9c6c0b51a1c6.pdf?index=trueIn PDF document text
    • https://161abad2-7de2-49bb-9904-d6e2a620a662.filesusr.com/ugd/2eec94_fe4737cf77eb4a42a67b6fce6608df59.pdf?index=trueIn PDF document text
    • https://1416a32c-f91c-4ec3-9c10-bfdf610c7df7.filesusr.com/ugd/76de1a_db7cd0b241274677aa8508ee91afa527.pdf?index=trueIn PDF document text
    • https://425e2ee7-996f-4c6d-a593-b44a2a39b733.filesusr.com/ugd/bb05c1_cc916eb038bb42ad941d2bca050ce82b.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f46f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46F 4464 bytes
SHA-256: e7e69343490c7e89f78aefdd2d1610190190cc2b08648c3fb60b869e8ea6c786
font_01_sfnt_off0001039f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039F 12020 bytes
SHA-256: 2adf7ec4a20b8f2d50f05a0e8790aa3742eb6434e76408b034d72e98a244a067
font_02_sfnt_off00012adf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADF 16092 bytes
SHA-256: 39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67
font_03_sfnt_off00013fa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FA6 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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