Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a4a074b52812d8e…

MALICIOUS

PDF

77.2 KB Created: 2021-04-08 06:20:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3acf21cae95a4ad526d8e6f35ad0e734 SHA-1: 733bf763a657e8d67a84777f563ba07b1b027bb0 SHA-256: 7a4a074b52812d8eea0a9e96264b52cef770019d0bf83bc0aa4abb37101b8e52
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9995

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://golowaki.ru/123?utm_term=c3+aircross+brochure+pdf PDF link annotation
    • http://prizinsta365.website/doxonujarokufisebamuvigkskmz.pdfIn PDF document text
    • https://xoravali.weebly.com/uploads/1/3/0/7/130775395/7425010.pdfIn PDF document text
    • http://realwockyc.info/rotten_tomatoes_best_movies_2018_audience_scorefj20r.pdfIn PDF document text
    • http://peludofnor.fun/razegoditibagivqr9u7.pdfIn PDF document text
    • https://jowavuzawevubab.weebly.com/uploads/1/3/2/3/132303017/19056.pdfIn PDF document text
    • https://lumovomudin.weebly.com/uploads/1/3/4/7/134704265/reditofevasek_turelupefezafa.pdfIn PDF document text
    • https://kagozekexep.weebly.com/uploads/1/3/5/9/135956698/ropadujujemixu.pdfIn PDF document text
    • http://totalcreditcheck.info/33040816372lazqu.pdfIn PDF document text
    • http://triple-doska3.club/37711437421pz2h4.pdfIn PDF document text
    • https://sazunanu.weebly.com/uploads/1/3/4/5/134596286/baxuwozas_falixofalari_zoditozukov.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/sisaxu/nbte_curriculum_for_business_administration.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/73359143943.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/bumobisekasixoriwoguxitu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4a075bf-90ed-4b44-a54d-3e5eb4674d67/53512432764.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/aurangzeb_s_religious_policy.pdfIn PDF document text
    • https://s3.amazonaws.com/gupojakami/bailando_full_hd_video_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jezobasit/can_covid_19_cause_anxiety.pdfIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/apush_period_1_review_packet.pdfIn PDF document text
    • https://s3.amazonaws.com/metakibeme/zanijis.pdfIn PDF document text
    • https://s3.amazonaws.com/kegovev/weekly_work_schedule.pdfIn PDF document text
    • https://s3.amazonaws.com/votawawo/konar_tamil_guide_10th_new_syllabus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03cd9c84-adc1-42cd-bd58-acf539a37900/how_to_calculate_geometric_average_with_negative_numbers.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_off0000f046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF046 5420 bytes
SHA-256: 3cbe4628b10e8850c60836829bc12a88cb01f2655b4073cbc1432cd9c26e5510
font_01_sfnt_off000102a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A0 10800 bytes
SHA-256: 1a1339590c6b8b9a018c067524033c582d8dd59189d746c686e6097eb5961654

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