Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f8eaf4d64767f8e…

MALICIOUS

PDF

77.1 KB Created: 2021-02-10 02:38:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5ad02c2efb9418ee8c511581c9ea2d49 SHA-1: 468faad98b61eb4b5bb0c8b380d1b27951918d48 SHA-256: 5f8eaf4d64767f8eb6626ba713271e29baf9b7b5657df58d4a7677a2fb1b11f1
184 Risk Score

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, appears to contain keywords related to search results, suggesting a phishing or scam lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wb?keyword=academia%20school%20simulator%20%20free In PDF document text
    • https://cdn.sqhk.co/kixarozikej/chgz0vt/classical_music_station_bay_area.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487423/normal_60134bee658d8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415544/normal_60054d5ce229c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476946/normal_601a64bc1777a.pdfIn PDF document text
    • https://cdn.sqhk.co/kerutadit/c0dgdm3/tegudinosatosefanufob.pdfIn PDF document text
    • http://vitrinachel.ru/garenejebasl4e4h.pdfIn PDF document text
    • https://cdn.sqhk.co/mosugukasiba/fhgihgg/xuzerefunobabipe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475000/normal_60166349ec246.pdfIn PDF document text
    • https://cdn.sqhk.co/butemobe/hjRCXgf/universe_sandbox_unblocked_games.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/illinois_state_board_of_nursing_contact_information.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/sodium_acetate_acetic_acid_formalin_saf.pdfIn PDF document text
    • https://s3.amazonaws.com/piwupevivotixi/94262654074.pdfIn PDF document text
    • http://zobawukesilebaf.epizy.com/bapifodejepedolotaxuje.pdfIn PDF document text
    • http://faputigumajo.rf.gd/xewejabiwipuboxobamuj.pdfIn PDF document text
    • http://fipugidu.rf.gd/general_ledger_trial_balance_report.pdfIn PDF document text
    • http://wotituxisu.rf.gd/adb_install_android_tv.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE370 5024 bytes
SHA-256: cec1547b486e3c9a245e802ec85382155b522f7091db3a417cd15dc611939033
font_01_sfnt_off0000f47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47E 10820 bytes
SHA-256: e1af83939a40eeb93ecf2dff832f54353f20771d67eceded97476c20040a517d
font_02_sfnt_off00011945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11945 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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