Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a9dba456767d901…

MALICIOUS

PDF

78.3 KB Created: 2021-04-03 19:33:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: b94c1ec335109a0bba9b1c27c28cb518 SHA-1: efe4ece8cba754cb14343054ea618f2988117314 SHA-256: 4a9dba456767d901fbcd70593a3059eb0109c5d90f77247917ca0ae45f0ff6ec
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mezovuduw.ru/strik?utm_term=what+is+business+writing+course PDF link annotation
    • http://lefefegibilapo.22web.org/madaline_neural_network.pdfIn PDF document text
    • http://aycotoro6.xyz/zixusovorosg1sxq.pdfIn PDF document text
    • http://lexaxak.mywebcommunity.org/windows_run_commands.pdfIn PDF document text
    • https://cdn.sqhk.co/nebafori/ij06Sje/65021915576.pdfIn PDF document text
    • https://cdn.sqhk.co/satukevaguka/lJUgfia/58484685789.pdfIn PDF document text
    • http://m-laskin.ru/988835299846p2u7.pdfIn PDF document text
    • http://workmonster.net/big_nate_download_freeitdma.pdfIn PDF document text
    • https://cdn.sqhk.co/wasusoguba/jbbii1N/58451482475.pdfIn PDF document text
    • http://gmetry.online/active_listening_strategies_teaching1wl8e.pdfIn PDF document text
    • http://zinekob.66ghz.com/77204346.pdfIn PDF document text
    • http://legalvictory.group/414001862734lpvr.pdfIn PDF document text
    • http://zaxanoxejem.iblogger.org/rataverujokoko.pdfIn PDF document text
    • http://jorowijedo.mywebcommunity.org/pinzamiento_tibio_astragalino_anterior.pdfIn PDF document text
    • http://life50it.pro/romeo_and_juliet_meaning_songrsfnr.pdfIn PDF document text
    • https://cdn.sqhk.co/fubafonu/0vEyjaI/slots_meaning_in_tamil.pdfIn PDF document text
    • http://shothard.site/how_to_sync_hampton_bay_remote_to_fandemt4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vawupebudifi.rf.gd/hypoxic_ischemic_encephalopathy_in_newborn.pdfIn PDF document text
    • http://velirogajebabe.epizy.com/wifi_bandwidth_limiter_apk.pdfIn PDF document text
    • http://lofadekiwi.rf.gd/44349571570.pdfIn PDF document text
    • http://vemibus.epizy.com/50386458995.pdfIn PDF document text
    • http://tirevotijo.epizy.com/battleground_s_survivor_battle_royale_android.pdfIn PDF document text
    • http://fixidil.atwebpages.com/togasokipiduforuto.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_off0000f346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF346 5276 bytes
SHA-256: 193e562f9d6ee3608c9f68578332b614f9ee62d28da53460781a0f368d8d2a49
font_01_sfnt_off0001054a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054A 11280 bytes
SHA-256: a641ad60f6d8cc26d856b79714fe52993d8cafafb635963e389dcd1bfcb93d42

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