Malicious PDF — malware analysis report

Static analysis result for SHA-256 551cf9d77cc7fad2…

MALICIOUS

PDF

77.6 KB Created: 2021-03-27 11:12:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a40d7d6c74c4175c011a1b0d1835f95 SHA-1: d045123c4e036fd833b1da5150d6c40513547a8b SHA-256: 551cf9d77cc7fad255d5f28e7072f7d838def63606ad04f7b6ab6a5baf89691f
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external links, forming a link farm, with one prominent URL pointing to a driver download lure. The PDF structure and the presence of embedded links suggest an attempt to redirect users to malicious sites, potentially for malware distribution or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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
  • 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://resalured.ru/strik?utm_term=dell+inspiron+6400+drivers+download+for+xp
    • https://cdn.sqhk.co/zetikitor/eifcid3/zombieland_double_tap_cast_salary.pdf
    • http://lalevuw.mypressonline.com/biografi_imam_ghazali.pdf
    • https://cdn.sqhk.co/muxaferamet/Uq9jiL7/88081301057.pdf
    • https://cdn.sqhk.co/nuvexajamu/qJgiLij/usps_thrift_savings_plan_loans.pdf
    • http://bosuxezaxad.mypressonline.com/causes_of_anglo_boer_war.pdf
    • https://cdn.sqhk.co/woxipepevati/7o3jdie/xisisob.pdf
    • http://naliputa.mywebcommunity.org/how_to_get_diving_suit_acnl.pdf
    • http://vetobiz.sportsontheweb.net/58062725747.pdf
    • http://bagidopivulo.mywebcommunity.org/wuxikujuwa.pdf
    • https://cdn.sqhk.co/tapowifilez/1CjfgcD/zopiguturagorumasepe.pdf
    • https://cdn.sqhk.co/wowixepis/iHqp9Gn/susaxamegikapuraf.pdf
    • https://cdn.sqhk.co/tejilunuf/hWijnjg/instagram_downloader_for_pc.pdf
    • http://gaxenop.medianewsonline.com/contabilidad_asientos_contables_ejercicios_resueltos.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://satawakerexe.atwebpages.com/tozaredelafazetof.pdf
    • https://44f39d5c-a655-4437-91b6-62b11e148e71.filesusr.com/ugd/eb4c03_443c1208080044f39b0d78af858e3ab9.pdf?index=true
    • https://ed36ca5d-e6e9-4caf-8bbb-3a8af5cfee16.filesusr.com/ugd/971556_fe687d755f78409a92841867cbb383af.pdf?index=true
    • http://zirutabu.myartsonline.com/84171360302.pdf
    • http://bufijonewufo.onlinewebshop.net/56794524694.pdf
    • https://e1bd05e7-a2ed-43df-b5fc-9bc8ee0b1a84.filesusr.com/ugd/08acf3_db86846cc3c54ac18af1fcb9e492e61b.pdf?index=true
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_f4a7e586a2c34f5387ce36628d4ff4af.pdf?index=true
    • https://ab60d57a-1f92-408f-9079-0b325776b613.filesusr.com/ugd/724fb5_9ca3ef3df880473b9bc0dffda2d81ab0.pdf?index=true
    • https://b64dd490-e5b9-492f-89ff-e398ecee904c.filesusr.com/ugd/5926b4_065074cd2a85420181a2d8d5c0b7f2df.pdf?index=true
    • 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_off0000f075.bin
173c568ddbb25f2f7298443627bf7590ae1913bf6d7b93092a3ecf35a8c3f17d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF075 5636 bytes
font_01_sfnt_off000103de.bin
4de967243053308846415bfb02e9cfbc6442ac3ae64af188cb13e47af22279dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103DE 11152 bytes

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