Malicious PDF — malware analysis report

Static analysis result for SHA-256 70c73d020e87ff38…

MALICIOUS

PDF

75.7 KB Created: 2021-02-10 17:48:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 40c420a2daa3684b58e1890baeaf6a82 SHA-1: 437aed718a2797a21a5800b22c3e8893698b05a2 SHA-256: 70c73d020e87ff38504815e791d59c0a8b781eb07e3f64ecdea6726cb7c2c96b
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 ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The embedded URLs, such as 'https://jottigo.ru/123?utm_term=the+waltons+season+9+episode+23+cast', are likely used to redirect users to malicious content or phishing pages.

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://jottigo.ru/123?utm_term=the+waltons+season+9+episode+23+cast PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385030/normal_600eae4f29617.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392237/normal_6022d24f62120.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413369/normal_600d5c96bf190.pdfIn PDF document text
    • https://gokaxavel.weebly.com/uploads/1/3/5/3/135316782/a2e497293137f0.pdfIn PDF document text
    • http://naturalik.fun/lujukuvati5qtxw.pdfIn PDF document text
    • http://redpandarecycling.com/1563013534dz26o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477864/normal_601090abb0632.pdfIn PDF document text
    • http://itabody.space/copper_prices_mnpmldt.pdfIn PDF document text
    • https://jesidovelagira.weebly.com/uploads/1/3/4/7/134705211/332562a7f374.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378604/normal_5fe72808b785b.pdfIn PDF document text
    • https://libizegenumejav.weebly.com/uploads/1/3/0/7/130775388/6717250.pdfIn PDF document text
    • https://vafukomoruf.weebly.com/uploads/1/3/4/8/134862603/penovarerenop_ramesutobex_kawavijobiso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416144/normal_5fd88ae0b6e29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452624/normal_600cb1b9bd2d4.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/xojafemori/tawaj.pdfIn PDF document text
    • https://s3.amazonaws.com/befafuni/reading_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/kukuwexelajeb.pdfIn PDF document text
    • https://s3.amazonaws.com/jazofi/zexorovazizojuk.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_off0000ea35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA35 5556 bytes
SHA-256: e9a97c4efeb408379aa45429438d68a17d275945f1e7e0159ecc94b77ec8f359
font_01_sfnt_off0000fd26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD26 10604 bytes
SHA-256: 519424b90e479ba27f27dc5da4927449eab87947348ea95571ae80b0628e43bb

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