Malicious PDF — malware analysis report

Static analysis result for SHA-256 990dc9a9730c7cfd…

MALICIOUS

PDF

80.8 KB Created: 2021-04-01 06:15:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 6b7550eaa5f20703a11848c673453d37 SHA-1: e352a81c6a9b88c22aa703027c9781b79334f4f8 SHA-256: 990dc9a9730c7cfd92c6321b55454791619de4d326d254c9f4f0d210c191913d
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains a large number of external links, many of which are likely SEO-driven. One of the primary external links points to a URL that appears to be part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains text related to a 'Calendario Pirelli 2020 pdf', suggesting a lure to disguise the malicious intent.

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 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.
  • 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://mezovuduw.ru/award?keyword=calendario+pirelli+2020+pdf PDF link annotation
    • https://ninozaji.weebly.com/uploads/1/3/4/6/134690112/d627badeb4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388156/normal_5fe640bc6f836.pdfIn PDF document text
    • https://zezupivipikoko.weebly.com/uploads/1/3/4/5/134596705/livudolaxasu_xukanukazine.pdfIn PDF document text
    • https://cdn.sqhk.co/danuzenanini/UDJ36jg/naruto_shippuden_3d_game_pc_free.pdfIn PDF document text
    • https://figinesixixe.weebly.com/uploads/1/3/3/9/133999389/pagetenid.pdfIn PDF document text
    • https://cdn.sqhk.co/ledumixifer/Jt3ictY/best_craft_furniture_mountain_wi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485165/normal_5fe3036a67589.pdfIn PDF document text
    • http://lokogosomezik.iblogger.org/jenit.pdfIn PDF document text
    • https://cdn.sqhk.co/xurajalijok/8fnRhb4/dofaruzawuwukavovuborapun.pdfIn PDF document text
    • https://dodapufil.weebly.com/uploads/1/3/0/8/130813701/3479148.pdfIn PDF document text
    • https://cdn.sqhk.co/wituruxa/fquhjru/kubugegepimobitapuxisenu.pdfIn PDF document text
    • http://dukozodi.iblogger.org/clustering_technique_in_teaching_writing.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/nabifovu/canon_eos_utility_software_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/xorileperikipaxodulu.pdfIn PDF document text
    • http://gajovab.epizy.com/list_of_robots_and_androids.pdfIn PDF document text
    • http://zinimivozu.rf.gd/tifixawofeluferagomivoba.pdfIn PDF document text
    • https://s3.amazonaws.com/boxujetanonikuv/saeco_coffee_machine_parts_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/gateme/nelebarumopove.pdfIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/magic_tree_house_55_release_date.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_off0000dc6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6D 5036 bytes
SHA-256: f0ea002f6ff304088954df7b6f448ba870980cab1336c0e9e0d9b87dcde58a79
font_01_sfnt_off0000ed99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED99 16004 bytes
SHA-256: a15651af95f86ab8bea9ebdad78d440a50ade077610a906309d98c5ea44aacaf
font_02_sfnt_off00011eda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDA 16060 bytes
SHA-256: 5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330

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