Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1661117021b50d8…

MALICIOUS

PDF

84.1 KB Created: 2021-03-03 07:17:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: fbcc9f84c90ffeeb8e1143a05c961794 SHA-1: d1f37db27114b8cdf1375622bd380bd0595ca2fb SHA-256: a1661117021b50d8996965afbf96cd555eeee0f5f54307add0f0f048e45604a3
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and numerous external URLs are indicative of a malicious campaign, possibly leveraging embedded JavaScript for redirection or exploitation.

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://kuzutuzo.ru/123?utm_term=paco+el+chato+historia+4+grado PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448976/normal_600a059d28a73.pdfIn PDF document text
    • https://cdn.sqhk.co/gejupajo/jbiggjk/crossword_mysteries_abracadaver_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/madufuxenuw/8heiejc/34677136633.pdfIn PDF document text
    • https://vajinivokesele.weebly.com/uploads/1/3/5/3/135326698/3009629.pdfIn PDF document text
    • https://cdn.sqhk.co/botonerepap/j4ZvgFX/birthday_cake_party_pics.pdfIn PDF document text
    • https://fopojikanerev.weebly.com/uploads/1/3/4/8/134888820/22a4395889bb.pdfIn PDF document text
    • https://cdn.sqhk.co/pobopuwubox/hfUgdjd/30594850528.pdfIn PDF document text
    • https://gadepututam.weebly.com/uploads/1/3/5/3/135325389/zuvivivexul.pdfIn PDF document text
    • https://cdn.sqhk.co/bozadukopufu/d2RkigJ/xesonigibowapibosalibab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416132/normal_5fdd6a7999ab7.pdfIn PDF document text
    • https://cdn.sqhk.co/melipetoluf/Krjh1gg/36972155874.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456985/normal_6023dc27246d5.pdfIn PDF document text
    • https://lasebotoxuxuxir.weebly.com/uploads/1/3/4/7/134729765/f23278970b7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481676/normal_5fc6be3860432.pdfIn PDF document text
    • https://jinobodusere.weebly.com/uploads/1/3/4/7/134722577/xikogazibivololu.pdfIn PDF document text
    • https://cdn.sqhk.co/nilesatu/h92dQia/68911704446.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/44jjlPM/application_flower_care.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000f964.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF964 13384 bytes
SHA-256: 6ffdcd754313f32496aed7a48e72e5850ab5010685e6996013fdb3c71ae08148
font_00_sfnt_off0000e778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE778 5288 bytes
SHA-256: 8ff7a237ad253983e07de8fec29ea62b4a0064c889d3677fe8092708a8c64919
font_02_sfnt_off00011e86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E86 10660 bytes
SHA-256: 5d433dc798e75c7d4b1c08fa6a2ca3a14aa0aa61f874ae70a88cacef291e053c

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