Malicious PDF — malware analysis report

Static analysis result for SHA-256 330f07ee5c658e40…

MALICIOUS

PDF

76.7 KB Created: 2021-03-15 06:58:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6219567dce675dc016ae4f61d82e2f5a SHA-1: b1978b0eb7e256bf8f2d5bce3e79d0ca99b9e6c6 SHA-256: 330f07ee5c658e405f962a1e8b3542459c5814620113cb2535481815359c770a
184 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirectors and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious redirection pattern, likely to a phishing site or to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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/wix?keyword=vector+addition+worksheet+1 In PDF document text
    • http://xedijama.getenjoyment.net/4896232687.pdfIn PDF document text
    • http://znohist.site/marketing_management_philosophies_exampleswth20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483602/normal_603fdb7bbf3d9.pdfIn PDF document text
    • http://mysteps.online/adobe_flash_professional_cs6_crackku58b.pdfIn PDF document text
    • http://zixivudu.getenjoyment.net/6114956549.pdfIn PDF document text
    • http://geforiro.scienceontheweb.net/radobepuwilowosep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464053/normal_601262e18d44d.pdfIn PDF document text
    • http://fallofelin.online/brother_printer_mfc_7360n_no_paper_error76cdp.pdfIn PDF document text
    • http://tuwasukam.getenjoyment.net/34652861781.pdfIn PDF document text
    • http://lalat.space/zanabajetokamalejizuj0lb9e.pdfIn PDF document text
    • http://ridaxaki.mywebcommunity.org/82583539232.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/35ba3432-8fc4-4bff-a525-4c16dda17113/65917757366.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/division_problems_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/lososimap/wunekomima.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b02665ac-7e73-41f5-8684-9e8b7784bbbd/45873914258.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1215cce-f088-4821-a3fb-d1511ff9cb8d/34476258946.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/hidden_meanings_brain_teasers_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7530d8f0-75ae-4bf2-98be-cd12fe541a01/3215296222.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd1144c4-f94b-47c0-9023-e8ccab046749/38701185274.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bac5862f-fd36-4d27-9237-297d14adff36/xbox_360_wireless_controller_price_in_sri_lanka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46186eb6-f562-4651-83b3-f61fd14ecd1b/17370306750.pdfIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/23103551866.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d93d4f9-4208-48f3-a3fe-493f4531226c/87844279104.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_off0000ed74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED74 5168 bytes
SHA-256: f004ef3e1369333fa7a148cc31b434f3e61a37137e99946b8879513337326cba
font_01_sfnt_off0000ff1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1F 11264 bytes
SHA-256: dd25d788106a9e16dbb7668370d1c1633011a53308a7f1f772be16da62b5b5ed