Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab8b8bba60b3f34d…

MALICIOUS

PDF

75.5 KB Created: 2021-01-23 04:19:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 958dc021eaf9cd120442fe891987863d SHA-1: 494f63e0a5dcb399502a8cf6ea7ac56fcd6050f0 SHA-256: ab8b8bba60b3f34de8bf1921ddef16a71af4395e280b57c25484b973e3fcdcd2
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to a site related to 'heroes war strategy guide', suggesting a lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://traffnew.ru/wb?keyword=heroes%20war%20strategy%20guide PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4391047/normal_5fc902046df77.pdfIn PDF document text
    • https://site-1178101.mozfiles.com/files/1178101/fasanamafuwepup.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491445/normal_5fca99e5b89bd.pdfIn PDF document text
    • https://cdn.sqhk.co/lejesapazud/hbaha7J/gods_of_rome_all_characters_list.pdfIn PDF document text
    • https://bupafenanibud.weebly.com/uploads/1/3/4/0/134042845/buwemuvikit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378378/normal_600b74e9e54ee.pdfIn PDF document text
    • https://site-1176112.mozfiles.com/files/1176112/452455114.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376375/normal_5fef46b9635c0.pdfIn PDF document text
    • https://cdn.sqhk.co/nerenina/iggcDlA/mirror_glaze_cakes_near_me.pdfIn PDF document text
    • https://site-1241850.mozfiles.com/files/1241850/dolch_sight_words_first_grade_list.pdfIn PDF document text
    • https://pufoxedoj.weebly.com/uploads/1/3/4/4/134438994/5068914.pdfIn PDF document text
    • https://site-1167986.mozfiles.com/files/1167986/vitamin_shoppe_return_policy_covid.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/geradi/93644882893.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/jaan_cartoon_title_song.pdfIn PDF document text
    • https://s3.amazonaws.com/sajezife/11277415113.pdfIn PDF document text
    • https://s3.amazonaws.com/gagagakigibapo/93648415835.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwawibu/bbc_learning_english_drama.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/wubiz.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/affidavit_format_marriage_registration_delhi.pdfIn PDF document text
    • https://s3.amazonaws.com/wibadinavosunom/17686724550.pdfIn PDF document text
    • https://s3.amazonaws.com/luropi/itil_continual_service_improvement_questions_and_answers.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_off0000eb48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB48 5116 bytes
SHA-256: 8b8c58010a696fff63ebf4ea5c85c4709bde6f99b6d2cc71b61e48da86dff5ba
font_01_sfnt_off0000fcd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD2 10552 bytes
SHA-256: 07c3acc64f3b87120d708a9b3bb45b6566953ef239b542d395384d98d4272778

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