Malicious PDF — malware analysis report

Static analysis result for SHA-256 73af72da767476fa…

MALICIOUS

PDF

75.5 KB Created: 2021-04-07 19:09:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3e3c2c524696a0555518c332cb9420ae SHA-1: 706c12101b228ca60af37379e96ee4b58f157a62 SHA-256: 73af72da767476faaf39b4d211b622463dd3bea2584ca1883d19a877f374f767
186 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 0.9998

Heuristics 6

  • 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.
  • 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://crophysi.ru/strik?utm_term=how+to+connect+verizon+remote+to+cable+box PDF link annotation
    • https://roxobirunuj.weebly.com/uploads/1/3/4/0/134096027/8fbe95eea79.pdfIn PDF document text
    • http://mosebuzixat.mywebcommunity.org/kandang_beruang_madu.pdfIn PDF document text
    • https://rimofunoduw.weebly.com/uploads/1/3/4/5/134525219/9099766.pdfIn PDF document text
    • https://nuzudaguzawoj.weebly.com/uploads/1/3/4/7/134717590/9653888.pdfIn PDF document text
    • https://dagigofeno.weebly.com/uploads/1/3/4/8/134887245/2077810.pdfIn PDF document text
    • https://potelukizul.weebly.com/uploads/1/3/5/9/135961045/kadufurufawuji.pdfIn PDF document text
    • https://cdn.sqhk.co/susojitigi/WjjHghN/doon_defence_academy_cds_fees.pdfIn PDF document text
    • https://cdn.sqhk.co/ramidazumiko/mRhhkhj/58991054982.pdfIn PDF document text
    • http://bitalotava.scienceontheweb.net/94187660572.pdfIn PDF document text
    • https://novigavaze.weebly.com/uploads/1/3/0/8/130874354/tezakur.pdfIn PDF document text
    • https://milonotupilo.weebly.com/uploads/1/3/5/3/135347339/fuzuf.pdfIn PDF document text
    • http://fewudutizoxom.medianewsonline.com/bumboat_cruise_on_the_singapore_river.pdfIn PDF document text
    • https://xizejaselaz.weebly.com/uploads/1/3/4/3/134357450/xisom-rafit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bef89f6e-6323-4b84-ad9d-a44490bfcc4f.filesusr.com/ugd/96768c_9311b9e1b7b54c8e8626bf77063c8267.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c178af9-f975-4abe-81c6-fbd13237ef5c/80663542800.pdfIn PDF document text
    • https://f766a7e9-a0d0-4e3a-bf7c-946d2e8c2ff4.filesusr.com/ugd/bddb96_a5723baff9cb42f69db846c55836e3e1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/13c3c37e-5914-4c1a-bf6c-3535b88e5baa/zagiloripeguserinepo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e9cd1ae-58b8-4a48-ac1c-bca58da63a3a/how_to_clean_speed_queen_dryer.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_off0000e842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE842 5140 bytes
SHA-256: 0aced646990c520986198744ef7de6fe5b2923af0555c56a98c476e5eebe16d4
font_01_sfnt_off0000f9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C0 11340 bytes
SHA-256: d9bc6b5bb4c8a523c0927264cb2eda04239e36e7bc06f8b06b79c7dfb6ab7d68

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