Malicious PDF — malware analysis report

Static analysis result for SHA-256 d300638bca51f2e2…

MALICIOUS

PDF

69.4 KB Created: 2021-03-02 22:29:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: a47208708d73c1529627c6cc820bf128 SHA-1: 0b634ccc95a92571c23563ace7141da82edad89c SHA-256: d300638bca51f2e2eb8478ea4a08cdb83810c761ed33186eabb67033878f6971
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fokemale.ru/123?utm_term=what+is+folk+culture+also+called PDF link annotation
    • http://chestlune.online/46133836976hoix4.pdfIn PDF document text
    • http://badge-verification-center.com/balance_sheet_equation_jaiibhp5tk.pdfIn PDF document text
    • http://gavediteriremuv.medianewsonline.com/sony_str_k790_remote_control.pdfIn PDF document text
    • http://fusekimutoxi.sportsontheweb.net/65369315801.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466370/normal_5fc75fb58dad3.pdfIn PDF document text
    • http://sukutoxuwurif.mywebcommunity.org/jizarafuwonadab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411922/normal_60131f44d402e.pdfIn PDF document text
    • http://ritixibetono.mygamesonline.org/sovafaraz.pdfIn PDF document text
    • http://zokidinodajives.getenjoyment.net/surudivapatutusale.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422367/normal_5ff5424876a02.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501810/normal_5fc72593bd8f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391909/normal_602080ce0c9e0.pdfIn PDF document text
    • http://wedipum.mygamesonline.org/their_eyes_were_watching_god_chapter_9.pdfIn PDF document text
    • http://chebsvet.ru/ardex_concrete_dressing5z40h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478670/normal_603b267331bfd.pdfIn PDF document text
    • http://ins.expert/wobujilleejw.pdfIn PDF document text
    • http://0fruits.space/pirate_ship_playhouse_plans45kas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rijemow.onlinewebshop.net/what_does_a_double_headed_arrow_mean_in_chemistry.pdfIn PDF document text
    • http://nejimafalun.onlinewebshop.net/daniel_kahneman_thinking_fast_and_slow.pdfIn PDF document text
    • http://tiredosutozol.atwebpages.com/emerson_mini_fridge_with_freezer_troubleshooting.pdfIn PDF document text
    • http://siwemoxoxawevuv.atwebpages.com/larapenunulosev.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_off0000d2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C1 5184 bytes
SHA-256: 8638fce0fa37b872f19cf05a5575abd536af9639e9a63db6ade64276efc9abab
font_01_sfnt_off0000e46f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46F 10080 bytes
SHA-256: c8765a793dbff029d6dd0156402aaf7290728a0528cb312e1b580aedf4c9e6fd

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