Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d1b9c6c2472aa4f…

MALICIOUS

PDF

81.4 KB Created: 2021-03-17 06:03:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: dad9f974599029642220e49b44333d1f SHA-1: 9a65f43947de49cf4920a507ae5d9c43b642586d SHA-256: 2d1b9c6c2472aa4f1370513f535b4552f5bb1786ed49379675bc6d58aebf2800
186 Risk Score

Malware Insights

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

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 0.9994

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://vilenefex.ru/strik?utm_term=la+private+investigator+license PDF link annotation
    • http://sanatoriy-izumrudny.ru/54104207291st8h8.pdfIn PDF document text
    • http://doucheapp.xyz/what_are_the_best_stock_markets_to_buy_in_gta_5sitwk.pdfIn PDF document text
    • https://norigawe.weebly.com/uploads/1/3/3/9/133988483/6000221.pdfIn PDF document text
    • https://cdn.sqhk.co/modajili/geOgdOw/2048_bubble_wars.pdfIn PDF document text
    • https://cdn.sqhk.co/nebafori/heYfdhg/26874318265.pdfIn PDF document text
    • https://cdn.sqhk.co/moxasapiwer/gijhagi/67808641324.pdfIn PDF document text
    • http://lnstagram-office.com/gusasufusexupx8gx.pdfIn PDF document text
    • http://zalavsky.ru/tensile_testing_laboratoriesxks7l.pdfIn PDF document text
    • http://jesofoma.getenjoyment.net/73272492923.pdfIn PDF document text
    • https://cdn.sqhk.co/jukelifawap/ahghaHm/real_followers_apk_latest_version_2019.pdfIn PDF document text
    • https://nuwofukejixi.weebly.com/uploads/1/3/1/4/131437867/d9bcf2219e8.pdfIn PDF document text
    • https://cdn.sqhk.co/dudumadopole/jEjUic8/lego_hidden_side_episode_15.pdfIn PDF document text
    • http://urott-hu.com/bividosavedaditidosagesr942.pdfIn PDF document text
    • https://cdn.sqhk.co/zezegawutogu/0gcghc4/likigabusebeli.pdfIn PDF document text
    • https://cdn.sqhk.co/bexexoro/hgjjbhj/golden_spike_rv_brigham_city.pdfIn PDF document text
    • https://kesoxebexug.weebly.com/uploads/1/3/2/6/132681937/daponivuliwotib.pdfIn PDF document text
    • https://cdn.sqhk.co/sowodopevew/IbDheib/cnc_milling_simulator_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/pigexebobe/bifhgFT/kemijimof.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fad58b31-c538-4d3f-828d-7998eec853b9.filesusr.com/ugd/7e6083_3f734df9fc494ab49afc6846792f2790.pdf?index=trueIn PDF document text
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_6f7ffd7b9ae444e1974d66d23cfef227.pdf?index=trueIn PDF document text
    • https://1639490a-f715-481e-9fb1-af38d332269b.filesusr.com/ugd/a59130_3ef8e16085cb4da59e2e74579007542c.pdf?index=trueIn PDF document text
    • http://pexirud.onlinewebshop.net/67319268504.pdfIn PDF document text
    • https://9f5bcc56-a059-4f00-ae85-604acd6a3d2d.filesusr.com/ugd/ac9354_5bfe18ac0ca644ffae3951ad8d69d06a.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF2 5104 bytes
SHA-256: 9fdc59f569a1b85c33bf15bfb063b17bcd84e84e4db1dfb45595fcdb1d6d7310
font_01_sfnt_off0001116e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116E 10992 bytes
SHA-256: 46767e188d5e0e791fd8afe0125e6d1d2d09f75107081b3d38c62889e013c1bf

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