Malicious PDF — malware analysis report

Static analysis result for SHA-256 17b3c135351280da…

MALICIOUS

PDF

78.6 KB Created: 2021-05-08 13:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d283d928b09dfbdd86bb84a0d607e24c SHA-1: e3d415f9d92888166358a6eeee1639980c919f1c SHA-256: 17b3c135351280da65be34dd1f3246779e6f857e00d4352b7db82f85b297b4b5
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://crophysi.ru/strik?utm_term=best+free+photoshop+tutorials+2020 PDF link annotation
    • https://pomixorum.weebly.com/uploads/1/3/1/6/131606605/nefapaxaku.pdfIn PDF document text
    • https://nofixemi.weebly.com/uploads/1/3/6/0/136082439/9c34d0318def371.pdfIn PDF document text
    • https://zuzivosojix.weebly.com/uploads/1/3/0/7/130775151/5722621.pdfIn PDF document text
    • https://cdn.sqhk.co/nakotuba/icifgiB/29759394639.pdfIn PDF document text
    • https://cdn.sqhk.co/sovanoniwuva/DhegfxS/pulse_rate_normal_values.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428054/normal_602d2fecab714.pdfIn PDF document text
    • https://cdn.sqhk.co/tevosenijosu/Z7dXu7L/59128573897.pdfIn PDF document text
    • https://kokagajimixepu.weebly.com/uploads/1/3/5/3/135331661/fcf470cd.pdfIn PDF document text
    • https://tisefujuset.weebly.com/uploads/1/3/4/4/134488269/f8f14045a.pdfIn PDF document text
    • https://pijawofixogut.weebly.com/uploads/1/3/4/0/134017865/83a7fe1c85300.pdfIn PDF document text
    • https://pelepidavivi.weebly.com/uploads/1/3/1/4/131454492/49fb860.pdfIn PDF document text
    • http://keepqifi.site/cuisinart_ss-700_recallpqm7w.pdfIn PDF document text
    • http://vpntop.info/breville_smart_oven_pro_bov845bss_manualursuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490917/normal_60681d9475cf3.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/3ed7df35-0ef9-41c7-a6f6-26d710a49621/how_to_plot_multiple_graphs_in_mathematica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd448ab9-5c6a-4d47-8713-6c9e2292ef0b/departamento_de_alimentos_y_bebidas_hoteleria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24347914-9a87-4918-bc4d-a44463273fff/genutaveputilinidexabik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf48302d-1e4a-4bd5-b83d-c1df93a0f211/how_to_pair_a_motorola_bluetooth_headset.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_off0000f40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40C 5312 bytes
SHA-256: 3886814dfaca5867e5ade99d8947f3099fccbeaeace9a2737d0c6820cdd2f5d6
font_01_sfnt_off00010617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10617 11460 bytes
SHA-256: 2a1e042423b5b476a49883ccaacf88b90b2e23dbbec58de604aaa03194ea979d

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