Malicious PDF — malware analysis report

Static analysis result for SHA-256 54aa22b7268f7bd9…

MALICIOUS

PDF

75.4 KB Created: 2021-03-18 01:52:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 0863149134cf20aeea8450944701e04b SHA-1: c64fb7fa77f1868fae4be17751cff1506ea592fb SHA-256: 54aa22b7268f7bd9723d7e97cc764c475657ec8dabfd663c258f318be8c4d219
126 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable hosting, and a heuristic specifically flagged it as a link farm. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it might be a generated document used to disguise malicious links. The presence of external URIs and the link farm heuristic strongly suggest the primary goal is to redirect users to malicious sites, likely for phishing or malware delivery.

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://leonvi.ru/wix?keyword=prologue+jellicle+songs+for+jellicle+cats+2019 PDF link annotation
    • https://cdn.sqhk.co/zogameva/UidibAA/tumedabizumetaj.pdfIn PDF document text
    • http://suzuxef.22web.org/42247084387.pdfIn PDF document text
    • https://cdn.sqhk.co/tororukiwuri/bJibKgi/the_manager_korean_show_ep_122.pdfIn PDF document text
    • https://cdn.sqhk.co/gebitasixa/hfmIjdL/hoplite_sword_length.pdfIn PDF document text
    • http://fogazino.iblogger.org/bengali_to_english_dictionary_book_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481158/normal_603239bf9fe60.pdfIn PDF document text
    • https://cdn.sqhk.co/gagupibi/fhdoMS9/muwuxowasunodopavikuke.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384640/normal_5fefec8e7a44c.pdfIn PDF document text
    • http://nimurifewitofa.22web.org/report_writing_in_english_grammar.pdfIn PDF document text
    • https://cdn.sqhk.co/bepeguvovori/dhgWBhb/wukibejorub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sesufoloj.epizy.com/89737311536.pdfIn PDF document text
    • http://madujenorenugax.epizy.com/lich_king_hearthstone_guide_2018.pdfIn PDF document text
    • http://noxofovamoz.epizy.com/13742667985.pdfIn PDF document text
    • http://ridufifaris.epizy.com/66533666427.pdfIn PDF document text
    • http://rodidop.epizy.com/rex_c100_pid_hmrsklet_szablyoz.pdfIn PDF document text
    • https://09972071-4174-499b-90b1-de3619f59f53.filesusr.com/ugd/d1c05f_a41dc64e8027476d9f50b19a6eaef112.pdf?index=trueIn PDF document text
    • http://depevabevidot.rf.gd/70963153838.pdfIn PDF document text
    • https://011f98f8-b45f-4578-a2fd-466b530f7845.filesusr.com/ugd/74e905_d1f278b2287249889859cbc4029af65b.pdf?index=trueIn PDF document text
    • http://zepitomus.rf.gd/74197762544.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_off0000e8df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DF 5608 bytes
SHA-256: 92eb5b4ea4cb74e9646d34022d9dd4553699cfd2b323681320e0b90cda284910
font_01_sfnt_off0000fc09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC09 10888 bytes
SHA-256: d457577ebeebd8fd203ad1292be72a63fa06d6cef64d250458c2b53fca55e8b8

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