Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc22bbf024c6b583…

MALICIOUS

PDF

77.5 KB Created: 2021-02-04 08:13:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 9e1940a6bd732503d94e9cb30d0aee0b SHA-1: e52df308a2d4b58d2f3931fa64b863163416134c SHA-256: bc22bbf024c6b583fff1d9d381f046910413008e5b911be284a3af6e01d871c8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The embedded URLs and the overall structure point towards the use of T1566.001 (Spearphishing Attachment) as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crophysi.ru/123?utm_term=christmas+in+brazil+book PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4385412/normal_5feb72c94d70d.pdfIn PDF document text
    • https://mogudigadoto.weebly.com/uploads/1/3/2/6/132695399/578845.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456128/normal_600ea2705bfff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470835/normal_5fe20553506d4.pdfIn PDF document text
    • https://cdn.sqhk.co/melipetoluf/igiiaUS/16050531327.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492278/normal_601470a719e9b.pdfIn PDF document text
    • http://xetumejowizaguk.22web.org/pelopu.pdfIn PDF document text
    • https://pawomasa.weebly.com/uploads/1/3/4/7/134737305/murutemiwipirubigewu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jidibavozajo.epizy.com/zeretomafenawilosibixepu.pdfIn PDF document text
    • http://wemubivoparuf.epizy.com/pink_flower_wallpaper_for_android.pdfIn PDF document text
    • http://kitalanexu.epizy.com/galorekironujewetibizefo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dabc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABC 7228 bytes
SHA-256: 2cb78d03f745499f831ae117477cb0fececaddaf67d82a24d75c5c6664d44e5c
font_01_sfnt_off0000f302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF302 5084 bytes
SHA-256: cf3cd0e39569a078a6c47e18a2f9086360a22ef05e28f9c33a1573a033f7a1e6
font_02_sfnt_off0001041c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041C 10856 bytes
SHA-256: 88c42d9d6f1899040b736e2fdd60897e97d9d951ee362799257dbd1d8ae3052e

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