Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b2d0cce7c57939d…

MALICIOUS

PDF

78.9 KB Created: 2021-02-25 10:59:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: fbfbceef38dc56aa8161d3d01b7c5d8c SHA-1: 0f247b409c9dcf5b35a26c2d66e1fce1082a6050 SHA-256: 8b2d0cce7c57939d11b8ed0494b1e09a8da073380db0578576e6470a69f35156
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, contains references to 'Crusader Kings 2 guide 2019' and metadata indicating it was generated by wkhtmltopdf, suggesting a lure to a fake guide page. The presence of external URIs and the link farm heuristic indicate an attempt to redirect the user to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/123?utm_term=crusader+kings+2+guide+2019 PDF link annotation
    • https://kakerenu.weebly.com/uploads/1/3/1/0/131071145/vivedobebojobo-timutofabi.pdfIn PDF document text
    • http://lamakexo.scienceontheweb.net/17701327395.pdfIn PDF document text
    • https://cdn.sqhk.co/sabiwizi/D8VhgzG/risk_analysis_example.pdfIn PDF document text
    • https://xilonoro.weebly.com/uploads/1/3/5/3/135314978/1dd325.pdfIn PDF document text
    • https://borerejo.weebly.com/uploads/1/3/4/0/134040615/kivuvami.pdfIn PDF document text
    • http://lajalura.22web.org/bangla_album_song_audio.pdfIn PDF document text
    • https://neverazu.weebly.com/uploads/1/3/4/9/134901342/nizenu.pdfIn PDF document text
    • http://want-seo.ru/jamazumewinalakokebutedo01av5.pdfIn PDF document text
    • https://cdn.sqhk.co/jesovolavig/jihggii/10_ways_to_kill_herobrine.pdfIn PDF document text
    • https://cdn.sqhk.co/widafopaj/c6iatjc/pototivof.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://tojozolatenizum.epizy.com/8975278537.pdfIn PDF document text
    • http://tixobanawogoki.epizy.com/avast_antivirus_serial_key_2038_free.pdfIn PDF document text
    • http://midofel.rf.gd/formal_letter_asking_for_information_about_holiday.pdfIn PDF document text
    • http://jatoxat.atwebpages.com/78605769352.pdfIn PDF document text
    • http://tudutov.rf.gd/best_penny_stocks_under_10_rs.pdfIn PDF document text
    • http://dajejat.rf.gd/26805945999.pdfIn PDF document text
    • http://rukosivujuxu.atwebpages.com/43483982618.pdfIn PDF document text
    • http://fuzariwa.rf.gd/10411026448.pdfIn PDF document text
    • http://kubumoran.rf.gd/parts_of_speech_test_worksheets.pdfIn PDF document text
    • http://supuwevul.atwebpages.com/konujejeba.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4F 5220 bytes
SHA-256: 845276f1837ae2d74791bc20c4f1418eb12933eab0a81bfc7da29bed1b640415
font_01_sfnt_off0000fc13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC13 10780 bytes
SHA-256: b627b75b5398dfb226600c1e36641f35c92547f45bf23bba7c79085ab8641d3e
font_02_sfnt_off000120ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AE 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

Open this report in the interactive analyzer, or submit your own file for analysis.