Malicious PDF — malware analysis report

Static analysis result for SHA-256 5af5850225594860…

MALICIOUS

PDF

86.8 KB Created: 2021-03-27 18:13:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 29a3f7a4d90128895e05eb1487e7f5ab SHA-1: cb089a214851db12a127962727932ac7c4a7c2c3 SHA-256: 5af5850225594860b47ace5f4a70869e8537132c9f52428e2dd00f323631ed85
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting an SEO link farm or phishing campaign. The primary URL, 'https://maypoin.ru/award?keyword=chander+pahar+bengali+novel+pdf', is presented as a search result, likely to deceive users into clicking through to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/award?keyword=chander+pahar+bengali+novel+pdf PDF link annotation
    • https://cdn.sqhk.co/dabozijide/FQbShiv/hatchimals_colleggtibles_list_of_animals.pdfIn PDF document text
    • https://begakidiwadagav.weebly.com/uploads/1/3/1/3/131397934/tigofevowipuzugo.pdfIn PDF document text
    • https://nurafotupitu.weebly.com/uploads/1/3/4/4/134495453/7559734.pdfIn PDF document text
    • https://cdn.sqhk.co/lifupowaseli/g5jh4ic/vavujadowajumuxazomav.pdfIn PDF document text
    • https://cdn.sqhk.co/toviranevu/buvggjb/basic_english_grammar_for_class_2.pdfIn PDF document text
    • https://cdn.sqhk.co/gebitasixa/oCa75vv/ziwewasuvupitalorab.pdfIn PDF document text
    • https://cdn.sqhk.co/badaxiloru/iig5Sge/asteroid_weather_radar.pdfIn PDF document text
    • https://zarojapejafaro.weebly.com/uploads/1/3/5/3/135347044/wudalid-fodomet-xinisejogipekow.pdfIn PDF document text
    • https://vixalabalu.weebly.com/uploads/1/3/4/3/134396729/fupoxorer_nenoxaxa_pafam.pdfIn PDF document text
    • https://botamelojobowi.weebly.com/uploads/1/3/5/3/135344227/kisovukusegabepab.pdfIn PDF document text
    • https://cdn.sqhk.co/verexumifo/gjie6HV/livale.pdfIn PDF document text
    • https://cdn.sqhk.co/sejixikerut/Ojhieib/fit_the_fat_2_new_game.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/sugowubuf/echocardiogram_report_meaning.pdfIn PDF document text
    • https://3b1a0cff-dc54-4917-88c1-cdf904a8db56.filesusr.com/ugd/60aab8_bde948b4a5b5463e9c2f0e793d49f878.pdf?index=trueIn PDF document text
    • https://6b5d12f1-3bbc-48af-9ddb-5430d2fe15e7.filesusr.com/ugd/3bf302_2de27274aeab4389bd725e09b81b1c04.pdf?index=trueIn PDF document text
    • https://506dbbd1-d4b3-44b1-a4c9-6b5d0cab6a23.filesusr.com/ugd/c75f60_f019f5ece6124698a58706bc21fb9dae.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/adagio_in_g_minor_trumpet_sheet_music.pdfIn PDF document text
    • https://e61e9f85-32c5-4861-9fd4-b89109084c35.filesusr.com/ugd/2e4eb4_7c49730a3d054c5190c559c4f02b7424.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCB 5228 bytes
SHA-256: a30c8fb2b7c5d4d5c70cbe2ea29c27989954328a1cf6bc4691c53d010c15e3cd
font_01_sfnt_off0000fd8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8C 4900 bytes
SHA-256: 22e614f70662915bb741154388250ca1446fec442c811913ca938b54c1b095e8
font_02_sfnt_off00010d8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8A 11264 bytes
SHA-256: c610c161a3dac4fd6225745d94474bf6587ed5e1931e6eb4ccb5e28abe6041bc
font_03_sfnt_off00013358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13358 17476 bytes
SHA-256: 1d49a188d7aa3c61dcbd0c806179fad846caa1e321c36b6a060302d06b47c3f6

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