Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe0471fa119e1f7f…

MALICIOUS

PDF

86.0 KB Created: 2021-05-13 14:04:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 08223ff69f3546ffabeb5695c475adcb SHA-1: 7d4dc415c0b51a1ae7eb0736b44445f07931e1f2 SHA-256: fe0471fa119e1f7f938bbe0f9a9387ff9013637e947ab2a50b93f1fe4f7c6e6b
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt, likely leveraging a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/strik?utm_term=evan+moor+2nd+grade+curriculum PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4404490/normal_5ff47b82b8315.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387056/normal_6001d9d975323.pdfIn PDF document text
    • https://fomimixa.weebly.com/uploads/1/3/4/7/134775862/ropofipezef-gusadizenujune.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408184/normal_602dc7a592dc8.pdfIn PDF document text
    • http://sazaleve.22web.org/bro_code_barney_stinson_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501634/normal_606544450bddc.pdfIn PDF document text
    • https://kupelaranix.weebly.com/uploads/1/3/4/7/134729830/277135.pdfIn PDF document text
    • https://pabebubi.weebly.com/uploads/1/3/2/6/132695301/552001.pdfIn PDF document text
    • https://vulodimov.weebly.com/uploads/1/3/4/8/134880101/fudutob.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • http://clobuss.ru/jugosa8um9b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367622/normal_5fe3859ab4447.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/214117d1-4c79-4ec5-9141-e3d76dd56483/moxilo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6bdc19d-f750-4b16-bc33-e3ef09d01f2d/can_you_make_pizza_dough_in_a_kitchenaid_mixer.pdfIn PDF document text
    • http://felakaselik.epizy.com/blitzkrieg_3_free_pc.pdfIn PDF document text
    • http://turixupifebut.epizy.com/5072531025.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9acbbc12-212f-4466-8598-977aa02b9f32/luguduvixekufujesif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22ea58db-9bce-4de8-973e-5baa20ba8257/binas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d12b553-29c8-44d4-897f-dabcfb6c9c5d/7465439563.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6886467a-b0fe-49f6-a57d-c37b40fac9e7/sig_sauer_p320_x_carry_leather_holster.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_off00011023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11023 5228 bytes
SHA-256: cb8a483fcbc9d6c70c3fcc7f13f46db8cf44dd466da04ad5a17b3ce1226eabc9
font_01_sfnt_off000121e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E4 11684 bytes
SHA-256: 64e8aa9e82156597a471f15a00e8c7d04ee60ccdecd1dea2f9e0b7032f7d51d1