Malicious PDF — malware analysis report

Static analysis result for SHA-256 4015c2827779c064…

MALICIOUS

PDF

69.5 KB Created: 2021-01-15 00:12:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: ea025231e1a55baebff33dc2a49192bc SHA-1: e970583f8a0de0ae82b4183a705ea7943d67e7d9 SHA-256: 4015c2827779c0644652692fecb83f402b8b9fb121daf7484f348d76df075f9e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The embedded URLs and the PDF structure itself are indicative of a phishing or scam attempt, likely using the document's title as a lure.

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://traffset.ru/aws?utm_term=5+point+likert+scale+range+interpretation+pdf PDF link annotation
    • https://xubidanata.weebly.com/uploads/1/3/4/8/134895671/peboxigunujoni-mawemulinud.pdfIn PDF document text
    • https://cdn.sqhk.co/bedogipaxog/VEhjqge/ring_toss_carnival_game_hack.pdfIn PDF document text
    • https://tizukusijevawus.weebly.com/uploads/1/3/4/4/134454617/28eef93158d23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454170/normal_5fad2dc47cc12.pdfIn PDF document text
    • https://kirorasonosa.weebly.com/uploads/1/3/4/7/134743937/3650e1a581f19f3.pdfIn PDF document text
    • https://cdn.sqhk.co/dudugetogi/gfnvuvG/kowawutibetekafuniba.pdfIn PDF document text
    • https://cdn.sqhk.co/nulegudup/wjc2Xgc/video_downloader_app_free_for_iphone.pdfIn PDF document text
    • https://zemabata.weebly.com/uploads/1/3/4/6/134677216/kidasudozoso.pdfIn PDF document text
    • https://sozazisoxiz.weebly.com/uploads/1/3/4/4/134463449/498ad3a5e36921.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fomawipafuz/lj_alleman_school_colors.pdfIn PDF document text
    • https://s3.amazonaws.com/tuletivotarupu/former_tvsn_presenters.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_off0000d160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD160 5416 bytes
SHA-256: 57035a9bba5347fea8f9f2e128d1fb63fa234c650d3dedc84c68e61800371380
font_01_sfnt_off0000e3de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DE 10884 bytes
SHA-256: f8faca506b1b8aef05a3078d3b5da9ef847e1ae47f45f2919abf6b6388eda6f3

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