Malicious PDF — malware analysis report

Static analysis result for SHA-256 f37f8e7d0c7dd1f4…

MALICIOUS

PDF

69.7 KB Created: 2021-02-19 12:46:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: d962360e646995708b6a561fafdb327e SHA-1: 9246580c525835e8ee99d900d7df075c0df980c6 SHA-256: f37f8e7d0c7dd1f410fe2f6c5f0b25625b122534abfd259c76f2fb623cda1db5
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains keywords related to an 'update' and a specific device, likely a lure to encourage clicks on the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://baarspo.ru/strik?utm_term=escort+passport+8500+x50+update PDF link annotation
    • http://medicalpracticementor.com/65353994317a6xb4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404725/normal_5ff3ee58309a5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388037/normal_5fe0b1cbc560e.pdfIn PDF document text
    • https://guxipalun.weebly.com/uploads/1/3/1/8/131857363/xojasujunojuma.pdfIn PDF document text
    • http://artistichomesolutions.com/adobe_flash_intro_banner_maker_freeriz7i.pdfIn PDF document text
    • https://bolowotusupiwam.weebly.com/uploads/1/3/5/3/135300352/5663196.pdfIn PDF document text
    • https://fumevido.weebly.com/uploads/1/3/0/8/130874276/310150.pdfIn PDF document text
    • https://cdn.sqhk.co/zenekukera/gfggBEn/70s_80s_tamil_songs_mp3_free_download.pdfIn PDF document text
    • https://fukuperuka.weebly.com/uploads/1/3/4/8/134883813/sifujupepev-tixos-nugurivamivaga-votugate.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414678/normal_601a50f81f2b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421208/normal_6023aafc10278.pdfIn PDF document text
    • https://cdn.sqhk.co/joxesinejag/tbicJje/72187258082.pdfIn PDF document text
    • http://forexgeeks.net/easter_speeches_for_3_year_oldszfw3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417308/normal_601bb743114fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502563/normal_600aacbdbdca1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485162/normal_5fd75db04d443.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483604/normal_5fe621a82b1c1.pdfIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EE 5520 bytes
SHA-256: 6cbf8f1255b7339fd086a84ecf44eac0bbdd59dcd72f318c12a53e38b86182dc
font_01_sfnt_off0000e4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C7 10980 bytes
SHA-256: da8c0d04c872c7808ad6c8fbf5ac746444a8ce44fdf6b8db8b0c2e6a6d134180

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