Malicious PDF — malware analysis report

Static analysis result for SHA-256 28f980d5da52879f…

MALICIOUS

PDF

88.5 KB Created: 2021-03-17 08:20:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c167742b8c980a6af27343bdedc1d66 SHA-1: b9c1e6eacaa15ede5780dd175f79850a86b2dd20 SHA-256: 28f980d5da52879f3efb2ff6deadcb5c92b266bd69e440eaf306eade10d8a89b
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, including a link farm, and is flagged by ClamAV as a phishing trojan. The ML classifier also indicates a high probability of maliciousness. The presence of embedded URLs and the 'Fake invoice / payment lure' heuristic suggest a phishing or social engineering attack aimed at directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://botokaw.ru/123?utm_term=adapting+our+tactics+guide
    • https://cdn.sqhk.co/muligumixe/cuigicw/zedototokaxugov.pdf
    • https://nudegono.weebly.com/uploads/1/3/4/6/134682657/panirugago-nebufajuvix-mapafowoja.pdf
    • https://cdn.sqhk.co/veladaxuzeba/D4iihiP/nibadadabefosupinib.pdf
    • http://zujewubowufonug.scienceontheweb.net/40096480399.pdf
    • https://cdn.sqhk.co/rivinodati/eggijjg/above_us_only_sky_film_izle.pdf
    • https://cdn.sqhk.co/makulowujip/hdy3hcf/49869020105.pdf
    • https://rofikilidoxomuk.weebly.com/uploads/1/3/4/0/134017179/8763336.pdf
    • https://vewudati.weebly.com/uploads/1/3/0/8/130873955/nidikabo.pdf
    • https://cdn.sqhk.co/lumozupa/UjaKsew/viradelenufewipile.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://durenifujogax.myartsonline.com/24248732094.pdf
    • https://s3.amazonaws.com/mudurixo/the_magic_flute_opera_summary.pdf
    • https://s3.amazonaws.com/rogugagatuf/63944098658.pdf
    • https://s3.amazonaws.com/magapeguwabe/kulaborowanofak.pdf
    • https://s3.amazonaws.com/jokotaziweluge/al_state_tax_form_a-_4.pdf
    • https://s3.amazonaws.com/tujeviwakirawu/wuvuxobudaxi.pdf
    • https://s3.amazonaws.com/gixawetopoli/jolly_phonics_grammar_handbook_3.pdf
    • https://s3.amazonaws.com/zagubip/bloodborne_laurence_the_first_vicar_guide.pdf
    • https://s3.amazonaws.com/viwoxuz/my_friend_dahmer_film_online_subtitrat.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011cea.bin
0027a1fc8c8d4a79d5582754b7abc24f4311cbc030032481ff5cfcfcd44e078f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEA 5196 bytes
font_01_sfnt_off00012ea6.bin
dbade12400c384ec1e8d4c1bd2d21515d5167b56f6405441148b7f91247ca2c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA6 11144 bytes

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