Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f208f8b0acde53c…

MALICIOUS

PDF

66.7 KB Created: 2021-03-20 19:01:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 42337a49410868579c05948b2a904793 SHA-1: eefcfc2fcb8b8a68219118cea08a10fb8c4e6ab9 SHA-256: 8f208f8b0acde53c15def12da7cb3a4f19387bc2251c31835d6fc2e408d69ed0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, pointing to various PDF files hosted on external domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself facilitates the attack by directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/wix?keyword=h+in+bubble+letters+small
    • https://cdn.sqhk.co/rotonoba/7gji5ic/pixel_car_racer_hack_2019.pdf
    • https://cdn.sqhk.co/xedufoga/61RJtjh/ivan_the_terrible_movie_2015.pdf
    • https://cdn-cms.f-static.net/uploads/4410204/normal_60241fb264231.pdf
    • https://static.s123-cdn-static.com/uploads/4491153/normal_6002627158be0.pdf
    • https://cdn.sqhk.co/lagitesavap/juhjh7C/judefasunuxubadudezorore.pdf
    • https://cdn.sqhk.co/kuderoxuz/bjegihf/guide_for_zooba_zoo_battle_arena_ios.pdf
    • https://static.s123-cdn-static.com/uploads/4427094/normal_5ff52462a5af4.pdf
    • http://es50off.pro/2753498832538mhm.pdf
    • https://cdn.sqhk.co/merabuvi/ig0hcvS/gakanovonazekagazofedu.pdf
    • http://naturaleone.space/angela_davis_an_autobiographyyyo66.pdf
    • https://cdn.sqhk.co/gufadiviw/Pjijjge/free_gems_for_monster_legends_no_verification.pdf
    • https://cdn.sqhk.co/gujowaxexag/ajiaihm/zomerikepikodavewizogefaf.pdf
    • http://bupro.asia/13959374495xfet4.pdf
    • https://cdn.sqhk.co/fomezawelud/hidCifh/teacher_assistant_certification_classes_nyc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/46ee57e2-2c9e-4b55-990f-42ba79fa140b/84419959474.pdf
    • https://76f5a3e5-08d8-4581-9975-6c1b933a1845.filesusr.com/ugd/dbbd16_4cd0c84f215c4a8a878d1dfea57ed729.pdf?index=true
    • https://2d2b1dae-c014-4902-97e6-c3f1d56915cd.filesusr.com/ugd/70e5f7_2a5989b5586c47e1b2fc08fcc70d4385.pdf?index=true
    • https://97d49ff2-d914-4ae4-8ac8-5e5cf5f77cad.filesusr.com/ugd/6350c7_1ce284b135504f9b93aad3ac6edd1c74.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e0112180-3d4a-4a5f-9cbc-9cc17ab8ddd2/75747126730.pdf
    • https://4e4301d6-cc9a-4939-960a-6b497c1efea6.filesusr.com/ugd/d78803_8f3cfa33fb6044cd93516150e3c78e52.pdf?index=true
    • https://357b8bef-7330-4cfe-b31d-389db25c4d5a.filesusr.com/ugd/4c76bf_37cfea99a88149fea5bfb09582f55830.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc06.bin
dac04743e7a25a68e9eb4aef55ba218cb460cf4d75df631ed43ec60a41df6c37		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC06 4932 bytes
font_01_sfnt_off0000dca6.bin
218f22dac249bf4e8c0d394e7b3ef644e9b6398cdb35a9295e964c42fb038df9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA6 9680 bytes

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