Malicious PDF — malware analysis report

Static analysis result for SHA-256 f902e80a67d40ad7…

MALICIOUS

PDF

72.7 KB Created: 2021-02-28 05:09:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: a01668e9b742e72996687c5dfafc4e65 SHA-1: 96abaa8effd3a9666b14a0be50920645f8dc02a2 SHA-256: f902e80a67d40ad7f2f30a00efa7222abdc3f98b5af1cbc1a959885a50f427c2
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least one pointing to a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM further supports this, indicating the document is designed to redirect users to external, potentially harmful, 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://bologen.ru/wix?keyword=elective+affinities+david+adjmi PDF link annotation
    • http://logmeinnow.xyz/nocturne_in_g_minor_chopin7e0qv.pdfIn PDF document text
    • http://buwovavozu.getenjoyment.net/52253811673.pdfIn PDF document text
    • http://sodahq.pro/what_is_a_2013_lexus_rx_350_worth62epp.pdfIn PDF document text
    • http://rawoxaxevog.mygamesonline.org/ps4_universal_remote_tv_codes.pdfIn PDF document text
    • http://sugameloxufe.mywebcommunity.org/is_m65_field_jacket_waterproof.pdfIn PDF document text
    • http://fkpravo.ru/482553205681uunb.pdfIn PDF document text
    • https://devatokur.weebly.com/uploads/1/3/2/6/132683056/duvezoriwulotawaj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://likutolejit.onlinewebshop.net/four_seasons_printables_kindergarten.pdfIn PDF document text
    • http://dakamonegip.rf.gd/how_much_do_special_forces_make.pdfIn PDF document text
    • http://sasukagisodubex.onlinewebshop.net/26127447937.pdfIn PDF document text
    • https://s3.amazonaws.com/minegikukovel/neural_tube_defects.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/notepad_format_java_code.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/android_binder_invocation_to_an_incorrect_interface.pdfIn PDF document text
    • https://s3.amazonaws.com/vikukinumet/super_mario_brothers_3_card_game_answers.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_off0000e0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AB 5164 bytes
SHA-256: fa15150ec272b3b909f3a24f3671c88ee2cc2da690b2d9aec9ded3a74c6819bd
font_01_sfnt_off0000f241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF241 10384 bytes
SHA-256: bfba2bd628d414b8d03e1d7aaeeac6eed086978ea9ac31c3e8fdbafff683e544

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