Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f7ca128859c93e7…

MALICIOUS

PDF

74.2 KB Created: 2021-02-01 09:17:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: f690834fbe5481a76fde618e1d8527b6 SHA-1: 42e9979900c77940f9f66da63660da739cf45dd6 SHA-256: 8f7ca128859c93e70820e0befb148359bb8c12128eca734fef95913eb4e27d83
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to S3 buckets with SEO-like filenames, indicating a link farm or SEO spamming operation. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The primary malicious activity appears to be directing users to a network of potentially malicious or ad-serving websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/aws?utm_term=comma+splice+fused+sentence+worksheet PDF link annotation
    • https://bozaxemavokasum.weebly.com/uploads/1/3/1/3/131383719/3908432.pdfIn PDF document text
    • https://fuvipizewovotat.weebly.com/uploads/1/3/1/0/131069886/suwoxuwolububov.pdfIn PDF document text
    • https://cdn.sqhk.co/pubodegosog/ubNt6gf/video_downloader_apk_mod.pdfIn PDF document text
    • https://jakigirizog.weebly.com/uploads/1/3/1/4/131453624/mejozefuxakibizete.pdfIn PDF document text
    • https://pafetinavip.weebly.com/uploads/1/3/4/8/134868030/4984086.pdfIn PDF document text
    • https://zotekuruwufuk.weebly.com/uploads/1/3/4/1/134108654/dazanaxok-wipafiti-gelome-ketumezax.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/punurum/gta_online_guide_to_making_money.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/good_food_guide_apple_pie.pdfIn PDF document text
    • https://s3.amazonaws.com/bisapovepizaj/2005_chevy_express_van_repair_manual_free.pdfIn PDF document text
    • https://s3.amazonaws.com/verirejon/best_graphics_card_for_gaming.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/let_it_go_violin_2_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/91741806859.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/lutron_caseta_bridge_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/jafitamezikubisarawu.pdfIn PDF document text
    • https://s3.amazonaws.com/patilawasu/bepodesa.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/29180954007.pdfIn PDF document text
    • https://s3.amazonaws.com/vudivuzakal/gibiv.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_off0000e3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B1 5456 bytes
SHA-256: 9fe50df8640748622a7a09da356140a046b9adc43d45e5dae4aed4ae6e807a5a
font_01_sfnt_off0000f620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF620 10920 bytes
SHA-256: 190b429c6dcaf915f098ac271e07e7cef58ee6ef99aa096ca4cc2aef4f10147a

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