Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd98071e72ea535d…

MALICIOUS

PDF

69.3 KB Created: 2021-02-23 17:41:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 3e6ed10fd1b3b4e174e508f09e5c406c SHA-1: 4a9485eae6cd6845d12f9c38ae339e9eb2540ab7 SHA-256: fd98071e72ea535d1e714b7d8ec9a6ef33405c1a13f4186c7a6e74209ba75e10
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm, suggesting an attempt to obscure the true malicious destination. The document body, though heavily obfuscated, appears to be a lure related to 'code.org lesson 13 answers', aiming to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/wix?keyword=code.org+lesson+13+answers PDF link annotation
    • http://jubisadamafav.22web.org/alangkah_indahnya_hidup_ini_raihan.pdfIn PDF document text
    • http://tizakeguwowil.22web.org/civ_5_strategy_guide.pdfIn PDF document text
    • http://reduslim-italiaufficiale.site/fotabamoridurarogumieuqvl.pdfIn PDF document text
    • http://judozine.iblogger.org/dowry_prohibition_act_1961_in_english.pdfIn PDF document text
    • http://jopkapopka.online/gexirawulipewuzepuke68ht1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://datadeb.epizy.com/alcatel_one_touch_evolve_5020t_firmware.pdfIn PDF document text
    • http://divasopib.rf.gd/what_are_the_differences_in_kitchenaid_stand_mixers.pdfIn PDF document text
    • http://pewesinelukaveb.epizy.com/1668127829.pdfIn PDF document text
    • https://s3.amazonaws.com/legipalofi/bujugowemu.pdfIn PDF document text
    • https://s3.amazonaws.com/zuponefi/jamurosatul.pdfIn PDF document text
    • http://tozegebefile.rf.gd/how_many_calories_in_taco_bell_value_menu.pdfIn PDF document text
    • http://galexuduxegi.epizy.com/air_force_1_white_womens_8.5.pdfIn PDF document text
    • http://wasalesex.epizy.com/99898577744.pdfIn PDF document text
    • https://s3.amazonaws.com/fodose/jebajebikine.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_off0000d323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD323 5236 bytes
SHA-256: df8d320f269cdb98f4e8295e73ae647c698f29bd6dcf0d6e6514e108cd14eeb3
font_01_sfnt_off0000e514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE514 10564 bytes
SHA-256: 33c02f716a6d141dd9d17b32cc172367344f2910b52d99177c6ec6102c0fce8b

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