Malicious PDF — malware analysis report

Static analysis result for SHA-256 26520d5401928ba7…

MALICIOUS

PDF

79.2 KB Created: 2021-04-08 21:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e9608eece7a1a38a4b1180564492826f SHA-1: 52ca7f5406a5bf24be9bc09eb3ab2ad23d75dc56 SHA-256: 26520d5401928ba7f4c261903d37858bbcb5ad0a686450edd80e3d2ab6b5a865
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or SEO spam. While no scripts were explicitly extracted, the PDF structure and link farm behavior are common in malicious documents designed to redirect users to potentially harmful sites.

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://fokemale.ru/strik?utm_term=honeywell+th5110d1006+focuspro+5000+thermostat+manual PDF link annotation
    • https://cdn.sqhk.co/ketusugedi/3xibWge/22407528344.pdfIn PDF document text
    • https://cdn.sqhk.co/letareximo/37Gibhb/23351850225.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378834/normal_601eeaab87beb.pdfIn PDF document text
    • https://butemupow.weebly.com/uploads/1/3/5/3/135338881/ca898731e.pdfIn PDF document text
    • https://cdn.sqhk.co/dixufeja/iWgf7gg/vr_virtual_work_simulator_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/pusobatosip/hjejjgd/46080015658.pdfIn PDF document text
    • https://cdn.sqhk.co/konajera/0geYEgd/tepesaxozejo.pdfIn PDF document text
    • https://nerilumasufut.weebly.com/uploads/1/3/1/4/131437044/ecdea82ccc37f1a.pdfIn PDF document text
    • https://cdn.sqhk.co/xijodepub/hdsRtia/new_york_traffic_cameras_time_square.pdfIn PDF document text
    • https://cdn.sqhk.co/filodomazora/tLjf5hj/final_fantasy_7_walkthrough_remake.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374951/normal_5ff23e97737fe.pdfIn PDF document text
    • https://cdn.sqhk.co/kikepedu/gcJdheP/48699308580.pdfIn PDF document text
    • https://cdn.sqhk.co/vadetegubufo/8EtMMoe/36947331553.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494669/normal_6060a7c185a32.pdfIn PDF document text
    • https://zovarufegurer.weebly.com/uploads/1/3/4/6/134625168/b75f9d458db8b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487382/normal_606e6024135b2.pdfIn PDF document text
    • https://cdn.sqhk.co/vabolepibe/ihaggif/46520465494.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c1d61d78-9bae-425c-b347-ee91470fe4f1.filesusr.com/ugd/60933b_6b3df1fd2e654d618acd8a79e2fad596.pdf?index=trueIn PDF document text
    • https://0dd0cd87-80d3-4eb5-b9c6-73c43c3a6fca.filesusr.com/ugd/f0b6b3_40449e5c2dc246dd9520a56bc1789740.pdf?index=trueIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E3 6024 bytes
SHA-256: 88acb9331c157cb318189eff52eb5d40116f888280bf82c17977d03f2e05cfae
font_01_sfnt_off0001085e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085E 10828 bytes
SHA-256: 025117b654f18ae32d3438f7b134515a25d1f4cac842d1d956ea027dbfd6826d

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