Malicious PDF — malware analysis report

Static analysis result for SHA-256 a216af49d2bf75e7…

MALICIOUS

PDF

85.4 KB Created: 2021-06-09 16:38:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 0564f9adc5e8476200fef3f0cfe2c642 SHA-1: 2f39d52c1615210920b6e93d3ccab25dc104f6bf SHA-256: a216af49d2bf75e7bb4ea2e267794f62c76b6792bc3e174e4469a1a516e2b271
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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 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://nomylo.ru/pbw?utm_term=slant+rhyme+literary+definition PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4401732/normal_6034533cbf8f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416321/normal_60bd7b85504f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388062/normal_5fe141cedff64.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389352/normal_5fefc92f7a5af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412394/normal_601d364ab8387.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462696/normal_605646b3cf498.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467043/normal_5fe9ec7e5915d.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/2e9cd642-ad4e-44ae-bb00-66be71f88b09/xuvabivanaxuletuzot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d4c30af-854d-40cb-b842-a274ec484ce4/baby_trend_expedition_double_jogging_stroller_parts.pdfIn PDF document text
    • http://sufizilofab.pbworks.com/f/how_to_adjust_brightness_on_amazon_kindle_paperwhite.pdfIn PDF document text
    • http://mikabipi.pbworks.com/f/nenarajapok.pdfIn PDF document text
    • http://kakexigodelo.pbworks.com/f/bunn_ultra_2_frozen_drink_machine_recipes.pdfIn PDF document text
    • http://xuwajesorewo.pbworks.com/w/file/fetch/144694866/o_mera_bhola_hai_bhandari_song_download_mr_jatt_mp3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e806119b-f23e-40a4-8d19-dd14371cbb42/bufexapifakifapin.pdfIn PDF document text
    • http://namikikis.pbworks.com/w/file/fetch/144705276/ekme_testi_raporu.pdfIn PDF document text
    • http://goxuluk.pbworks.com/w/file/fetch/144876513/heli_hogu_kaarana_book_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2095013c-7066-476c-ac3a-98061111c964/19552946886.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cde2abe8-032f-44f5-907c-dd04d35fc86b/osi_model_real_world_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f47668d4-0272-4af0-a40b-031353f1ebb4/bukufiju.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_off000110dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DC 5176 bytes
SHA-256: bd1a5300a14c5128cc4cc229f82491260bd4a09e0f4b2b068000039c19b2fa78
font_01_sfnt_off00012253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12253 11428 bytes
SHA-256: 459a0b622a62e6fd728441f3452eef7b3e8fe6527e5aae82c73be3d332906c10

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