Malicious PDF — malware analysis report

Static analysis result for SHA-256 74bdf440ad41f68d…

MALICIOUS

PDF

74.9 KB Created: 2021-02-16 19:51:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3644f4c20b0f1e0d81b331100b85aa85 SHA-1: 17d7d284b06631b0386196787018b7615ccf3b71 SHA-256: 74bdf440ad41f68dfd6d7630fdc3133e0b80c1cdc2f226324b777a55b8ad5e77
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of external URIs and the overall structure point towards a malicious PDF designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/123?utm_term=the+history+of+love+review
    • https://pojuzalik.weebly.com/uploads/1/3/4/2/134235388/214550.pdf
    • https://static.s123-cdn-static.com/uploads/4466376/normal_5ff288fb3f775.pdf
    • https://static.s123-cdn-static.com/uploads/4482860/normal_5fcbec85eb594.pdf
    • https://gonedosi.weebly.com/uploads/1/3/4/7/134730609/fagiwak.pdf
    • https://cdn-cms.f-static.net/uploads/4457279/normal_60265ef02e8c6.pdf
    • https://static.s123-cdn-static.com/uploads/4490746/normal_5fceceaf69728.pdf
    • https://cdn-cms.f-static.net/uploads/4413347/normal_60288b3a88ab0.pdf
    • https://static.s123-cdn-static.com/uploads/4407747/normal_5fce1301a4be9.pdf
    • https://static.s123-cdn-static.com/uploads/4387427/normal_60023a8c74623.pdf
    • https://telavepifamika.weebly.com/uploads/1/3/4/3/134352802/pivevasunuvo.pdf
    • https://static.s123-cdn-static.com/uploads/4485173/normal_5fcaf84754c08.pdf
    • http://jadurunus.22web.org/altistart_48_catalogue.pdf
    • https://cdn-cms.f-static.net/uploads/4376874/normal_5fdbd8d238ce2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://jojisoxig.epizy.com/zolivuwisegoduziwidur.pdf
    • http://janoniwopezodul.epizy.com/xamujaxarexelasopiva.pdf
    • http://zofewodugap.rf.gd/94622327397.pdf
    • http://vadawowugozopul.epizy.com/besame_mucho_guitar_tabs.pdf
    • http://vapasiwivomod.epizy.com/egyptian_cotton_sheets_vs_sateen.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc80.bin
8c1235cae9d6d4a27dd684b33a6e6a3d3dc136345c0ef99d87d9ef1c7d28d407		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC80 4528 bytes
font_01_sfnt_off0000ec0c.bin
aa17268c750c8bf9501e8c400a6c78d56d42c4c244516f9ed9a702afade9a19d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0C 10560 bytes
font_02_sfnt_off0001102d.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1102D 4324 bytes

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