Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc64e1557f3f466d…

MALICIOUS

PDF

82.5 KB Created: 2021-04-03 13:14:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 7d13fad8c921247e35c698f3a3668187 SHA-1: 5974174013c7e22e44a269d611b00bdee49d659a SHA-256: fc64e1557f3f466d989765e0d545c7d41d27f80c0fe75840100fe29f80f0eb17
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=empty+oceans+empty+nets+worksheet PDF link annotation
    • https://cdn.sqhk.co/mozejipakas/FidKkY6/skylanders_trap_team_characters_ebay.pdfIn PDF document text
    • https://cdn.sqhk.co/ribobujir/hhififm/sql_server_clustered_index_insert_performance.pdfIn PDF document text
    • http://springwin.space/derogatory_tradeline_credit_reportuhk6m.pdfIn PDF document text
    • https://cdn.sqhk.co/vopofuxo/icThbym/66326667365.pdfIn PDF document text
    • http://rastet-malysh.ru/pozikejaxam9j0qu.pdfIn PDF document text
    • https://cdn.sqhk.co/mowamukar/hfLhghf/sword_maker_game_download_apk.pdfIn PDF document text
    • http://rexapeduke.66ghz.com/lowigidezagodalokewivu.pdfIn PDF document text
    • https://cdn.sqhk.co/tobepeliv/ijeVgd3/download_text_message_tone_android.pdfIn PDF document text
    • https://cdn.sqhk.co/zasemewiti/xhfjind/saxuduxawarasurotipijivi.pdfIn PDF document text
    • https://cdn.sqhk.co/papazokixe/0ANxQjh/movietickets._com_gift_card_balance.pdfIn PDF document text
    • http://vijepuwobewi.mygamesonline.org/sovolaguxewededugiwupimi.pdfIn PDF document text
    • http://trelon.fun/noribexufenunsly0f.pdfIn PDF document text
    • https://cdn.sqhk.co/mobirewin/FYnPYhb/just_knock_off_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/nikofejujel/RdEiagj/men_s_button_up_short_sleeve_shirt_pattern.pdfIn PDF document text
    • http://nefritthebestthing.site/verifone_vx520_ctls_manualu8164.pdfIn PDF document text
    • https://cdn.sqhk.co/womilepeba/m8gU9IF/anydesk_android_remote_control.pdfIn PDF document text
    • http://mon-compte-cmb.best/zajafisovamudepubepgwlm6.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8df9d1b7-8f6e-49e1-bdac-c9da4d4291fd.filesusr.com/ugd/12c198_805d47db8c574409970d52ce667145b7.pdf?index=trueIn PDF document text
    • http://pexabeni.rf.gd/58836196825.pdfIn PDF document text
    • https://2e907eb7-0cdb-46e5-a4de-ff0e34d1b96e.filesusr.com/ugd/7ea2c5_3b61988be5f24e98b2bee69d58160d6c.pdf?index=trueIn PDF document text
    • http://vogizopenukese.epizy.com/75028632706.pdfIn PDF document text
    • https://4771f60c-9559-4da0-84b6-7e0db70f7697.filesusr.com/ugd/f9d4cd_76701e0c03c34fe3a1297f52fe66ea9a.pdf?index=trueIn PDF document text
    • http://kupobazixivev.rf.gd/kejiwujudaxijebopakuwit.pdfIn PDF document text
    • http://lumosaneja.onlinewebshop.net/74888663306.pdfIn PDF document text
    • https://911f1565-2faa-4874-b261-330d521e7362.filesusr.com/ugd/f46427_c67254da27da4a24bdeb052ad417a4ec.pdf?index=trueIn PDF document text
    • http://givetupazowo.onlinewebshop.net/5632231248.pdfIn PDF document text
    • https://c8070bf9-ed42-4c5d-8eb8-ca35ee70f136.filesusr.com/ugd/d38238_0dd20433502f44b2a6d5aa9f709d3161.pdf?index=trueIn 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_off0000f887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF887 2104 bytes
SHA-256: 029466eeff2d40ad444c1baceb9f0e525eb11fe26167c6bd8e12f5a128ca7c0f
font_01_sfnt_off0001024e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024E 5356 bytes
SHA-256: 7b7d98d1c4ba267f999551f864e38f338b4c8db46c33c0eec832fc3910d3c026
font_02_sfnt_off00011476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11476 11144 bytes
SHA-256: ef6bb01e8f515ef6355fd4b2f1e9bd9b0bcebec02f77b8c022530c813169335d

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