Malicious PDF — malware analysis report

Static analysis result for SHA-256 e523e3c7023ab571…

MALICIOUS

PDF

80.2 KB Created: 2021-03-22 04:04:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 28cc18bdb025e8673f785f15cbe0d794 SHA-1: 097a1321447540f51cec3063b54d162d807ab822 SHA-256: e523e3c7023ab571f4c3fd208be675451b983c1fc8fbd91ba43c926abd8b0acd
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a strategy to distribute links across many domains, likely to obscure malicious destinations or for SEO manipulation. The presence of embedded URLs suggests an attempt to redirect the user to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/award?keyword=statistical+analysis+with+python+pdf PDF link annotation
    • https://cdn.sqhk.co/mojerakikav/idthjje/57507419832.pdfIn PDF document text
    • https://cdn.sqhk.co/posojuvapono/hbT2Dgc/dangerous_dave_2_dos_download.pdfIn PDF document text
    • https://cdn.sqhk.co/dodiniwotud/1hd8ghi/brutal_street_2_all_characters.pdfIn PDF document text
    • http://muzoc.xyz/what_time_is_the_stock_market_open_psttlufb.pdfIn PDF document text
    • http://vavenuvukubanav.22web.org/kivarelegodeduvizewonup.pdfIn PDF document text
    • https://cdn.sqhk.co/xoripudesew/3mgc3jd/progressbar95_easy_nostalgic_hyper-_casual_game.pdfIn PDF document text
    • http://sagedix.medianewsonline.com/70748249151.pdfIn PDF document text
    • http://bewerab.22web.org/alter_ego_b2_french.pdfIn PDF document text
    • http://ravigimojamel.mypressonline.com/91817613425.pdfIn PDF document text
    • http://comp-arenda.site/jufatunudivarouufi6.pdfIn 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://biborufa.epizy.com/malmesbury_primary_school_uniform.pdfIn PDF document text
    • https://13cfbe10-32e4-4d7a-9072-8dbd3280e6b8.filesusr.com/ugd/994e9e_f40287f65aa74f5085a2a801f9cb2087.pdf?index=trueIn PDF document text
    • http://badisaxutut.rf.gd/schwinn_spin_bikes_for_sale_uk.pdfIn PDF document text
    • https://ced6af22-cf5f-4df0-9cd6-2d424634d287.filesusr.com/ugd/3eed2b_6aefdb0dcd8648778af3f4fc4b0aed8d.pdf?index=trueIn PDF document text
    • https://b01cffea-7a05-49e8-9781-04202a21c04b.filesusr.com/ugd/d5d855_91c886a56fde411392f818d3e153d797.pdf?index=trueIn PDF document text
    • http://zesafemumibow.myartsonline.com/84317325733.pdfIn PDF document text
    • http://mozolawaguj.epizy.com/able_to_extract_converter_free_download.pdfIn PDF document text
    • http://fasajixibapa.epizy.com/wawudozezosu.pdfIn PDF document text
    • http://rexalovujomorox.epizy.com/california_association_of_realtors_residential_lease_agreement_revised_2018.pdfIn PDF document text
    • https://eed7fa7e-4f31-4ba6-8269-e73f07ac74c5.filesusr.com/ugd/93374d_7adf32a670b64ec8acb49a7db04c7cbc.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEE 5112 bytes
SHA-256: 97c95cb707813f1a269572abf305d820051da6781f5b2c900a9ffa43fda5dc80
font_01_sfnt_off0001004b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004B 10756 bytes
SHA-256: 11a268ae5dd2c6a85900b11eca9835d280775c3d9a00e9c5f84822b8be6e4fbe
font_02_sfnt_off00012504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12504 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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