Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a2591c74f0a2522…

MALICIOUS

PDF

72.3 KB Created: 2021-03-12 16:38:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ade98222d8e4286546699551b50aa5c3 SHA-1: e9302c403565441694be83c921038590db8680f0 SHA-256: 0a2591c74f0a252264ee7b0e5939ddfc4b4478685f86cb98682b50b94a8e1dbf
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malicious redirection attempt. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs further supports a malicious intent. No scripts were extracted, but the document's structure and embedded links suggest it's designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://golowaki.ru/wix?keyword=hecm+fixed+rate+unusable+funds PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4374953/normal_5ffce447a544e.pdfIn PDF document text
    • https://cdn.sqhk.co/sexubozadifa/gdhVihJ/pirate_battleship_game.pdfIn PDF document text
    • http://emirofficialzm.com/9200631583bvc52.pdfIn PDF document text
    • https://cdn.sqhk.co/rabataxuvax/cjgg9RR/23572004972.pdfIn PDF document text
    • https://cdn.sqhk.co/nojedevatas/hfYijyp/flow_player_for_pc_free_download.pdfIn PDF document text
    • http://goodsun.space/ibanez_gsr200_3_knobsnroxy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475565/normal_604a68505bc69.pdfIn PDF document text
    • https://cdn.sqhk.co/fipimomozuk/ggdhajy/w3layouts_blog_template.pdfIn PDF document text
    • http://wotedogupowu.sportsontheweb.net/247310609.pdfIn PDF document text
    • http://astrohelp.space/pevafejefereluzepufere7ofgr.pdfIn PDF document text
    • http://itmax.info/gunipemibagurelubijuykbra.pdfIn PDF document text
    • http://nadipewin.mywebcommunity.org/vitamaster_treadmill_1700.pdfIn PDF document text
    • https://cdn.sqhk.co/lididiregi/gihggmw/19484550945.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378852/normal_603a12377aaf1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366375/normal_601f0437402d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491927/normal_603cac6bcf9f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408703/normal_5ff6aeda1fd52.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/67f18e40-e4ba-4c5b-96ad-f41372f961f9/nikon_d40_battery_charger_price_in_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4f0296f-8003-43e1-b1ef-64a68de8a97f/unix_command_cheat_sheet_vi.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_off0000de34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE34 5336 bytes
SHA-256: 56e4977626ce7b9ba1091113195ffd4ad686d6e79841f7e4a4d12d2751e92bbc
font_01_sfnt_off0000f044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF044 10596 bytes
SHA-256: ae76410ca1b383c8b06119936e7077acbf753362b3ab90f92460655e219c1634

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