Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a015228df53ac3f…

MALICIOUS

PDF

79.9 KB Created: 2021-05-18 19:03:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 22fbd7974c7d7791321fd064ac8d81a7 SHA-1: 73a16066e692ff50659c7d665c90fbdb76e774a0 SHA-256: 4a015228df53ac3f2f0810d4a9161845d7a9e714bac44a88f63120d34895502e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are likely part of a link farm designed to improve search engine rankings or distribute malware. The primary URL, 'https://fokemale.ru/strik?utm_term=beachbody+challenge+group+name+ideas', suggests a lure related to fitness challenges, likely intended to trick users into visiting a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://fokemale.ru/strik?utm_term=beachbody+challenge+group+name+ideas PDF link annotation
    • https://fogujudusimasob.weebly.com/uploads/1/3/4/7/134713994/sizag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387933/normal_60266b74813fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405419/normal_5fe79fb17591d.pdfIn PDF document text
    • https://biwamuneluzotip.weebly.com/uploads/1/3/2/6/132696598/dogeduta.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389603/normal_6062018d40a13.pdfIn PDF document text
    • https://vigijamavo.weebly.com/uploads/1/3/0/9/130968937/5929e4199.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462714/normal_5ff7cd2c7f2d6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae8d5788-414d-40af-ba7d-9904ae27de91/how_to_critically_analyse_a_journal_article_in_psychology.pdfIn PDF document text
    • http://poruworetizilu.epizy.com/calligraphy_paper_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/gopuze/castor_informatique_resultat_2017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/766f176d-bb71-453b-b876-503982a4759d/banepipozunamuxagupi.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/adobe_acrobat_2017_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wifukedot/pencil_drawing_house_images_download.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/tuzov.pdfIn PDF document text
    • https://s3.amazonaws.com/jopomodilamego/husqvarna_372xp_x_torq_workshop_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/rixevozajixezos/alarm_clock_android_studio_code.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/html_number_format_mask.pdfIn PDF document text
    • http://mamuwudusaxu.epizy.com/31133837220.pdfIn PDF document text
    • https://s3.amazonaws.com/pegozegi/splash_screen_generator_android_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e1dc96f-4aa2-4be6-a6de-c11684c988d4/91646800204.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_off0000f99c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99C 5780 bytes
SHA-256: 26038f614a84d1d6829bd0400f862e4d43e0848fc890cd9e8592698ead973ebd
font_01_sfnt_off00010d19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D19 10988 bytes
SHA-256: 495a30351078ab53c9f8ca86f01cdcd634ac2ef2b09aac453661b775aea5f3c8

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