Malicious PDF — malware analysis report

Static analysis result for SHA-256 563fdf64323bdde5…

MALICIOUS

PDF

72.6 KB Created: 2021-02-20 17:17:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: cb0522e2847dc95cbd570e5efe400607 SHA-1: 801cefc782ab72ef925e06c4b8531fd734a9da7b SHA-256: 563fdf64323bdde53ec2d49143c42c2b78a99cf9f6191a98e47dc4b9f23dd4af
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

Heuristics 5

  • 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 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/123?utm_term=what+does+return+of+service+not+served+mean PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369911/normal_602a118ee0fe2.pdfIn PDF document text
    • http://habercigo.com/lixavodwtkx.pdfIn PDF document text
    • http://adr-media.work/rejosezarenemomibamumulaquo7c.pdfIn PDF document text
    • http://cardioactiveufficiale.site/watch_transporter_2_onlineews09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417037/normal_5fe709fc737e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411919/normal_6003bf82f22ca.pdfIn PDF document text
    • http://onlineeshop24.xyz/wintergatan_marble_machine_piano_sheet_musice66d5.pdfIn PDF document text
    • http://indonesia2health.online/7508893256255hb2.pdfIn PDF document text
    • http://coolmag.biz/jilekinveblr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496826/normal_60053bd349e25.pdfIn PDF document text
    • https://cdn.sqhk.co/keserina/ifrBjdy/find_hp_switch_ip_address.pdfIn PDF document text
    • http://reduslim-officialsite.site/2233430095330e3y.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402297/normal_600dc63044889.pdfIn PDF document text
    • https://cdn.sqhk.co/naliwanik/hhjjiiI/87323628727.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/nabifovu/10th_class_mathematics_book_andhra_pradesh.pdfIn PDF document text
    • https://s3.amazonaws.com/jevelel/whatsapp_status_katun_video.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_off0000e036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE036 5300 bytes
SHA-256: 05d4757d53fb384522fd4202861d701a29d02c9c4a6350e8d18dff928cc11d10
font_01_sfnt_off0000f224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF224 10384 bytes
SHA-256: 3a0c72c46885034b7079db434f4941e1a53ced76d5f8c04a25ab5d90cb72bc45

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