Malicious PDF — malware analysis report

Static analysis result for SHA-256 b081c0d7f0e1eb21…

MALICIOUS

PDF

109.9 KB Created: 2021-03-30 08:15:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: ed792f6fefaf8b151da3a289a2528354 SHA-1: 498fa5f0836bf41fba60083294114b1728f55679 SHA-256: b081c0d7f0e1eb21c2ecbe39408f9a821ee5fdee0822fcb116ba9cff1fc701c6
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used to redirect users to malicious 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://kuzutuzo.ru/award?keyword=article+370+in+kannada+language+pdf PDF link annotation
    • https://cdn.sqhk.co/nasubivapu/nuxPicn/stream_free_movies_on_xbox_one.pdfIn PDF document text
    • http://toxipoxekej.medianewsonline.com/jaxutexegagunazituwesow.pdfIn PDF document text
    • https://cdn.sqhk.co/noneniwetav/RZ2zgjb/77846581462.pdfIn PDF document text
    • https://cdn.sqhk.co/sixepatexup/f2B9hgB/35639476825.pdfIn PDF document text
    • https://cdn.sqhk.co/nexasolonit/giciigf/anyone_comics_brooklyn.pdfIn PDF document text
    • https://cdn.sqhk.co/feripamapuv/hdijjji/kenolek.pdfIn PDF document text
    • http://topukovatawosu.sportsontheweb.net/do_you_have_to_warp_in_the_game_trouble.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/lemerisinivum/jozob.pdfIn PDF document text
    • https://b3d988c2-7a7d-4c3c-9141-221b6550481e.filesusr.com/ugd/9dda13_079af2941ee542279a9466339d5ff7bc.pdf?index=trueIn PDF document text
    • https://43fe4710-460a-4ad3-90dc-2dd795c51528.filesusr.com/ugd/a32c20_dc16909ed43d4044a7346e27d1c912a0.pdf?index=trueIn PDF document text
    • https://2863666b-9d79-467d-9aad-9eeb6dafbdf2.filesusr.com/ugd/6ee3eb_cfc304fe68004d4abb254f8019e8736c.pdf?index=trueIn PDF document text
    • https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_5552f5d982f24cfdadfbfaa9635c08a2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/magnesium_oxide_pre_lab_question_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/kiguteperilodu/come_configurare_webmail_aruba_su_android.pdfIn PDF document text
    • http://wujagenak.atwebpages.com/bsmrstu_admission_circular_2020_18.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/62496063935.pdfIn PDF document text
    • https://s3.amazonaws.com/safago/selena_gomez_wolves_ringtone.pdfIn PDF document text
    • https://c482eaa1-e3aa-4fde-9473-53ba98cc9791.filesusr.com/ugd/94322e_41983ef24df94b2da8c751dbff0eddff.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_off00016ff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FF0 5584 bytes
SHA-256: ab0ca751ceb2b11eb0a6534df4dcfabc48af18c251de2c7ccdbe5205b6106caa
font_01_sfnt_off00018318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18318 11736 bytes
SHA-256: 7059cc4fa98db686852a7c535124ee27153ff844133616af7311c63a78318b67

Open this report in the interactive analyzer, or submit your own file for analysis.