Malicious PDF — malware analysis report

Static analysis result for SHA-256 867941d755016905…

MALICIOUS

PDF

75.3 KB Created: 2021-04-10 12:14:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: ff046b5211060138826aa529e271fd55 SHA-1: 2ee3503142cf4caca22c829ad3b0cd17aec6f402 SHA-256: 867941d755016905b3c890d973d10c2a8910c78124eadd809f640b3d7cf229c5
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous external links, with one specifically pointing to 'zajinet.ru/strik', suggesting a phishing or redirection attempt. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports that the document is part of a link farm designed to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://zajinet.ru/strik?utm_term=sherlock+holmes+short+stories+sir+arthur+conan+doyle+pdf PDF link annotation
    • https://cdn.sqhk.co/melalisopapu/gdghyjd/mulisodofana.pdfIn PDF document text
    • https://cdn.sqhk.co/dekaroku/hbhi3qG/fizimisogul.pdfIn PDF document text
    • https://velonifiwivuli.weebly.com/uploads/1/3/0/7/130739758/muwugakudidonez.pdfIn PDF document text
    • https://totamozosapopa.weebly.com/uploads/1/3/4/7/134712517/ralidivapuvibo.pdfIn PDF document text
    • https://mivetemadika.weebly.com/uploads/1/3/4/4/134471856/25773ca.pdfIn PDF document text
    • https://mozijazese.weebly.com/uploads/1/3/4/4/134460989/sepofas_nalotukaduwole.pdfIn PDF document text
    • http://fuvilejolo.iblogger.org/32552832573.pdfIn PDF document text
    • https://fularoxu.weebly.com/uploads/1/3/1/4/131452806/wuvev.pdfIn PDF document text
    • https://guwevene.weebly.com/uploads/1/3/1/4/131437413/887fbccbe90f91a.pdfIn PDF document text
    • https://disaximineta.weebly.com/uploads/1/3/4/8/134883765/2973100.pdfIn PDF document text
    • http://pusokum.66ghz.com/vifureropunolomoxigazo.pdfIn PDF document text
    • https://cdn.sqhk.co/lexebogefaj/ggdjd2w/endnote_cite_while_you_write.pdfIn PDF document text
    • https://cdn.sqhk.co/wapuvalapowa/jukje5Y/tyga_house_party_music_video.pdfIn PDF document text
    • https://cdn.sqhk.co/varomapit/YghghkG/pidopesexagagovevagazam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc2c9786-bcf3-43de-a082-91fd4ed39778/why_does_the_raven_repeat_nevermore.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/fuwitupezexazes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50bd2fdf-c9ff-4f4f-8b60-609eeba14edd/picture_books_to_read_aloud_to_5th_graders.pdfIn PDF document text
    • http://kevulapoxokimif.rf.gd/28926785753.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/mudotalexiwidujiseni.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/sijupusaririlawexew.pdfIn PDF document text
    • http://kosinatatit.rf.gd/notafemupajeselex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea5d4aa6-6111-425a-b0be-b34a4e8f535d/14425263817.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/louisville_10_day_weather_report.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE818 5664 bytes
SHA-256: 6a297afad0b5555096c610f1f6672c0769489a282f48bb250734be2063985c06
font_01_sfnt_off0000fb3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3B 10804 bytes
SHA-256: f3c1b31c1e70fd53bff95f0231f7eaf1a7b1da8ff3b101e09cf57a492daf380f

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