Malicious PDF — malware analysis report

Static analysis result for SHA-256 110cf7c77db67972…

MALICIOUS

PDF

74.5 KB Created: 2020-12-27 09:58:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 93f995dda7b6151ef931720784dd2b1f SHA-1: a25567e292199c395d1edc79d7fbf4cec0658de4 SHA-256: 110cf7c77db679725631edde1312c816e89ec841adc5a9d2117798ec140c1cf3
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://traffset.ru/strik?utm_term=analisis+foda+definicion+autores PDF link annotation
    • https://tixovokibena.weebly.com/uploads/1/3/4/1/134109053/39b752f506a.pdfIn PDF document text
    • https://cdn.sqhk.co/zopinulepa/rgdgisQ/73867215443.pdfIn PDF document text
    • https://putigazabikikim.weebly.com/uploads/1/3/2/6/132682718/1395216.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421787/normal_5fcf5a56d5b6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382629/normal_5f96e724eb223.pdfIn PDF document text
    • https://fuvekusegubo.weebly.com/uploads/1/3/4/7/134736786/708649.pdfIn PDF document text
    • https://tixanesel.weebly.com/uploads/1/3/4/2/134234664/vefekebilorasulutuwe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460966/normal_5fc2fef42fd2a.pdfIn PDF document text
    • https://cdn.sqhk.co/rurokusulos/cieliaJ/16663254449.pdfIn PDF document text
    • https://cdn.sqhk.co/netesatova/4PiehzL/funny_baby_stickers_for_whatsapp.pdfIn PDF document text
    • https://cdn.sqhk.co/guledijuxi/ig4hgcQ/rollerball_mouse_pro_2.pdfIn PDF document text
    • https://dururamud.weebly.com/uploads/1/3/4/8/134846475/b1bc1d970.pdfIn PDF document text
    • https://cdn.sqhk.co/wafixagi/i4haOia/sexetededudadus.pdfIn PDF document text
    • https://jevusesapa.weebly.com/uploads/1/3/4/7/134765100/6de9d02.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/xukirizugukugi/fibonacci_numbers_and_the_golden_ratio.pdfIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/bhoot_fm_12_october_2018.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_off0000e844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE844 5004 bytes
SHA-256: efd599593d6d13c3ae4dc704cf4603c5d546b411c1c10c175b7a85d059bb6492
font_01_sfnt_off0000f955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF955 10436 bytes
SHA-256: 7661e4f11b028fcf960a20d747831ab1837066eaee0261870c17856d9a6caaff

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