Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a74bcedafa87b41…

MALICIOUS

PDF

69.5 KB Created: 2021-01-18 21:15:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: f53a45b89bb609ada0e1f8405a1caf22 SHA-1: e7a521b13b7cd0e9b602835c08eb23452afa8c5c SHA-256: 7a74bcedafa87b412335f7678e2994ba327dfc8f6be0d87760e018e620e39cca
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, which is characteristic of a link farm designed to direct users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs and the overall structure suggest an attempt to trick users into downloading further payloads.

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://trafftec.ru/123?utm_term=geometry+dash+2.1+download+apk PDF link annotation
    • https://vegiranelikir.weebly.com/uploads/1/3/4/3/134399044/gatowakixep.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzonabudad/qBic4rb/16796432082.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390056/normal_60055998d9767.pdfIn PDF document text
    • https://cdn.sqhk.co/temejikowewa/bWBYjjJ/tibawinolekokel.pdfIn PDF document text
    • https://wepebagelokej.weebly.com/uploads/1/3/4/5/134583559/8432599.pdfIn PDF document text
    • https://cdn.sqhk.co/baponakazu/bhghjcJ/78873798473.pdfIn PDF document text
    • https://cdn.sqhk.co/vadetegubufo/8OMoR8n/8467587939.pdfIn PDF document text
    • https://bopugokux.weebly.com/uploads/1/3/4/9/134901566/575a4.pdfIn PDF document text
    • https://wovugijewinekox.weebly.com/uploads/1/3/0/7/130739614/72d29d7365.pdfIn PDF document text
    • https://cdn.sqhk.co/wejagamewo/gjde5hd/best_free_online_homeschool_curriculum.pdfIn PDF document text
    • https://cdn.sqhk.co/zisujidixa/f1nBq6K/10_panel_std_test_at_home.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365619/normal_5f86fb4c7f7ec.pdfIn PDF document text
    • https://cdn.sqhk.co/kenipafitu/jiJheji/soccer_star_2020_cheats.pdfIn PDF document text
    • http://xavelodezazil.iblogger.org/66755206139.pdfIn PDF document text
    • http://vifijes.22web.org/offline_dictionary_free_for_android_mobile.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410217/normal_5fcc22a746978.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pibekolovaxizon.epizy.com/deductible_home_mortgage_interest_worksheet.pdfIn PDF document text
    • http://kaxogesidod.epizy.com/bejobabubibap.pdfIn PDF document text
    • http://zojasofox.epizy.com/36882106085.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_off0000d34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34D 5704 bytes
SHA-256: 5e5499f5bf7b10b738756e4af698899fd938a721db62908ac85ee82ccc901285
font_01_sfnt_off0000e6b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B1 10088 bytes
SHA-256: 090958e33620c0521d9209606b4234903f890b84ad5db73dd4e981363d09cdd9

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