Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bb2f95e75ce01c7…

MALICIOUS

PDF

87.5 KB Created: 2021-03-19 19:07:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 523ce7519f271a35cefd593b1a9ee6cb SHA-1: d39e601a02e372e590578aeb354ba92e128b9c22 SHA-256: 8bb2f95e75ce01c756238c1aa8c0f933e6e8b0535b98d85e44be1bc7ba2bf500
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least one pointing to a domain flagged as potentially malicious, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF is designed to host many links on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://pelibifir.ru/award?keyword=embryonic+stem+cells+pdf PDF link annotation
    • http://form-copyrightservices.com/certified_network_defender_textbook9lzyk.pdfIn PDF document text
    • https://kipejuxi.weebly.com/uploads/1/3/2/6/132682137/terixi-tugekamugafep-mezifedu.pdfIn PDF document text
    • https://xevefoworux.weebly.com/uploads/1/3/1/3/131380592/najarimegosa.pdfIn PDF document text
    • http://lumogodasekepi.mypressonline.com/man_in_the_high_castle_season_2_episode_6_car.pdfIn PDF document text
    • http://ultra0.space/mirofeok28o.pdfIn PDF document text
    • http://gachihyper.xyz/binary_code_translator72q1h.pdfIn PDF document text
    • https://fazugiwe.weebly.com/uploads/1/3/4/0/134012697/99d0e2acf.pdfIn PDF document text
    • http://girlsbeach.space/does_powerline_reduce_speedtl50g.pdfIn PDF document text
    • http://tortomsk.ru/43786445225xpok0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lojubefogugiku.onlinewebshop.net/daihatsu_sirion_2020_manual.pdfIn PDF document text
    • http://ponuwisakaso.rf.gd/munchkin_10_oz_weighted_straw_replacement.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/stephen_kings_it_streaming.pdfIn PDF document text
    • http://wavuxab.epizy.com/piazzolla_adios_nonino_tango_rhapsody.pdfIn PDF document text
    • https://a9750898-a066-404d-a796-54a2f5ad13bb.filesusr.com/ugd/60231a_385868201def40a4a72297eabc745ca2.pdf?index=trueIn PDF document text
    • https://7afcd0b8-98df-42a4-afe0-9544d44c9539.filesusr.com/ugd/74e9cf_056851cc06de4363a7f65ef42081ec12.pdf?index=trueIn PDF document text
    • https://3315be42-5dab-4b6e-b44d-105cb490973e.filesusr.com/ugd/2e3488_ede0b72f30374cabb9e919fa0c6b87c9.pdf?index=trueIn PDF document text
    • https://c1bbde11-5cda-4f7c-8b74-b2fe90b484f5.filesusr.com/ugd/1c8c6c_dd367eac9bc54add8d18fbc6d3ac3476.pdf?index=trueIn PDF document text
    • http://xubobesirubujo.rf.gd/61514281682.pdfIn PDF document text
    • https://s3.amazonaws.com/sajezife/14312472278.pdfIn PDF document text
    • http://mogewatiside.epizy.com/xudupokugaga.pdfIn PDF document text
    • http://fasasipapuzu.rf.gd/8229840757.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE42 5292 bytes
SHA-256: 3438e3febbb03a42fa6160eeeb05d06f6126b165e8a6fe539d0fdeda2e7c10e9
font_01_sfnt_off00011035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11035 13732 bytes
SHA-256: 50a3f113e1a33f5fa9c82c09ea017df2d1f15fa923e70e3c22db9d8090cb7735
font_02_sfnt_off00013a01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A01 16192 bytes
SHA-256: 296b33a6e69ac3fa8ed420f1d1b401a0712a5a108b7c5c6efc73671719323d57

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