Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cfb41cd12e474cc…

MALICIOUS

PDF

88.0 KB Created: 2021-05-15 23:34:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: d9465094d02a0a14cae7fb4980030018 SHA-1: 27a7061ffa75159944afabf904f5e181df1df60d SHA-256: 1cfb41cd12e474cc2dc28973b925777ec33c3c1775bbc14d6b7117dcf173257c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 one prominent URL pointing to 'maypoin.ru', suggesting it functions as a link farm or phishing lure. The PDF structure and embedded content are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/strik?utm_term=league+of+legends+patch+notes+10.25+release+date PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382973/normal_60382595ab300.pdfIn PDF document text
    • http://kyponnik.online/54451368281idpq4.pdfIn PDF document text
    • http://nomanodix.iblogger.org/28056028493.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401555/normal_5fe5e2804a659.pdfIn PDF document text
    • http://kpovli.ru/186444135156vumk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427293/normal_601dc83874d54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424400/normal_601eaa4bf1ae9.pdfIn PDF document text
    • http://autolombardpro.ru/82964408126hwaxz.pdfIn PDF document text
    • http://christinaanddavid2019.com/samsung_a105f_root_file9yjc5.pdfIn PDF document text
    • http://originalhallyu.com/dulizumagoqznes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444649/normal_605c0ee4c7afd.pdfIn PDF document text
    • http://contentmedialiteracy.com/zazusatalasanagogoxe66545.pdfIn PDF document text
    • http://douchehq.xyz/a_woman_in_berlin_2008_full_movie_sub_indonesia638wu.pdfIn PDF document text
    • http://helplnstagram-confirm.com/what_is_the_most_powerful_word_in_the_biblepw63a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://najanezajuv.epizy.com/37039506328.pdfIn PDF document text
    • https://438e95ed-c264-4db5-88d3-1a9ca8b91b86.filesusr.com/ugd/733c1f_59c5938b917a45178c559515291c9a99.pdf?index=trueIn PDF document text
    • https://df256b98-640c-444d-885a-8195c7360722.filesusr.com/ugd/40b9e6_54b4f53a12114731a842622fcc951656.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3E 5840 bytes
SHA-256: 1d88f29b1dc9b3f24a8e8e8993413773d338a17c28ad90c984f8dc22cdb06405
font_01_sfnt_off00011231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11231 13468 bytes
SHA-256: 73bc88c66cc67ffbb2176dce2d6dbd3d931a69fde6e48ad277f0dbb9a3e28bb2
font_02_sfnt_off00013d48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D48 16100 bytes
SHA-256: bc19aca94bfee2209a3c651442fd516c1caa3e8778234ad1df2d48792ee80a74

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