Malicious PDF — malware analysis report

Static analysis result for SHA-256 10128f4e7f0deb60…

MALICIOUS

PDF

77.3 KB Created: 2021-03-02 02:12:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 1ff62c248dd6a2df21fc50aaad600c6f SHA-1: a77a7fa9375076bcd2f0f7e68c340cd993730646 SHA-256: 10128f4e7f0deb60fafa4081d7d69a23ad8bfb244aab648fca88dd1782b15e24
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The document body, though heavily obfuscated, contains a lure related to job interview questions, suggesting a phishing attempt to redirect users to malicious sites.

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://gimoguvi.ru/strik?utm_term=java+collection+interview+questions+and+answers+for+3+years+experience PDF link annotation
    • http://jevosetixa.iblogger.org/tofamula.pdfIn PDF document text
    • http://revujutipisan.22web.org/teturo.pdfIn PDF document text
    • http://likedizar.medianewsonline.com/how_do_i_reset_my_funlux_camera.pdfIn PDF document text
    • https://tefifegewa.weebly.com/uploads/1/3/4/3/134335978/6522569.pdfIn PDF document text
    • http://mapotilij.mygamesonline.org/the_outsider_book_sparknotes.pdfIn PDF document text
    • http://mebevevi.mywebcommunity.org/gone_michael_grant_wiki.pdfIn PDF document text
    • https://jeduwisuduxib.weebly.com/uploads/1/3/1/4/131483356/5921231.pdfIn PDF document text
    • http://manekobe.22web.org/stylus_palm_rejection_android.pdfIn PDF document text
    • https://gaxasexafarud.weebly.com/uploads/1/3/4/5/134590452/829c9a8d6.pdfIn PDF document text
    • http://tipofeliluget.medianewsonline.com/15265327371.pdfIn PDF document text
    • https://zimegusak.weebly.com/uploads/1/3/4/6/134605775/f65205.pdfIn PDF document text
    • http://hightrade.club/bufajutinoroxesijubio4k2x.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://futiwani.rf.gd/donobesevokavus.pdfIn PDF document text
    • http://sexuduwivaz.rf.gd/87099737205.pdfIn PDF document text
    • http://rimalapotozuf.epizy.com/47458073616.pdfIn PDF document text
    • http://bavatesivo.myartsonline.com/how_much_is_dish_welcome_package.pdfIn PDF document text
    • http://zesivigodexewig.epizy.com/aarya_2_movie_free.pdfIn PDF document text
    • http://verirajoxa.epizy.com/how_to_clean_a_cooks_coffee_maker.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_off0000e3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E8 5632 bytes
SHA-256: 7bc9a7fc6baf72cf6c15f7c828d38a685bbac7e68b42e6c9b7312cdd75a328f8
font_01_sfnt_off0000f73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73B 9792 bytes
SHA-256: e9281fa3f72fa972f8259a881752c3c19815c596ce720a1eeaae705e8a7bdc85
font_02_sfnt_off000118bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BC 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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