Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ba3c592b62f75bc…

MALICIOUS

PDF

82.4 KB Created: 2021-04-04 03:33:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6221cd7dcc998b9bd442628f9e5f52c9 SHA-1: 1bc741e190c3215b7f352d5f9b9add3517bea3ea SHA-256: 7ba3c592b62f75bc3cf940b394c00ee680cc888ba8bf5a9a93ba5fbaef10ad4e
186 Risk Score

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 0.9992

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://xajibur.ru/wix?keyword=13.2+the+genetic+code+answer+key PDF link annotation
    • https://lasasozizo.weebly.com/uploads/1/3/4/0/134041343/8770640.pdfIn PDF document text
    • http://nout-sale.site/151382106184kcms.pdfIn PDF document text
    • http://aromaita.space/979704699184tg2e.pdfIn PDF document text
    • http://jurojegame.getenjoyment.net/safety_razor_vs_straight_razor.pdfIn PDF document text
    • https://joninotabuxid.weebly.com/uploads/1/3/5/3/135387421/sifedime.pdfIn PDF document text
    • http://samettemiz.xyz/epson_3020_filter5zdoc.pdfIn PDF document text
    • http://republvinb.fun/3343216141687111.pdfIn PDF document text
    • http://stalekost.site/how_do_you_set_a_casio_atomic_watch6mk5x.pdfIn PDF document text
    • https://fiwuvoreguno.weebly.com/uploads/1/3/4/0/134000104/7465233.pdfIn PDF document text
    • http://foyou.store/21423617895gokx1.pdfIn PDF document text
    • https://vokidasurodetax.weebly.com/uploads/1/3/6/0/136089353/subuza_dejitila.pdfIn PDF document text
    • http://nout-sale.site/cells_alive_animal_cell_answers28nvy.pdfIn PDF document text
    • https://fapusogemewesil.weebly.com/uploads/1/3/2/3/132302858/mazirubigi-lovamekagurovaj-gegimod.pdfIn PDF document text
    • http://palikexifumalam.mywebcommunity.org/47518877938.pdfIn PDF document text
    • http://zumbayuliya.online/sketch_block_family_font_free_download4wmhm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://369206df-e466-4f8f-9771-850d1edb33c5.filesusr.com/ugd/8fd5dc_95ce043d662b466ea6202c1ce45ab565.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a70aa3c-0293-4ccd-9c01-f70d24b7e891/isaac_newton_laws_of_motion_equations.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33bd4a67-4a22-4224-8903-4094589950bd/wordpress_username_requirements.pdfIn PDF document text
    • https://1cdd1dcb-54a5-4750-95ad-c4cce9a68cd1.filesusr.com/ugd/1e32c2_ff574e8cf7a14662bda3ed5fe83ffa4e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e51352f3-ee4d-4b78-b27e-70bf8d3fd8e4/the_boy_in_the_striped_pyjamas_novel_activities.pdfIn PDF document text
    • http://peledopa.myartsonline.com/76297052983.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4262d68-2563-4e4c-a3b3-ff89fe46b78a/gedibugaxufulogubiko.pdfIn PDF document text
    • https://580b68e3-2104-4118-ae5b-4f285de1c062.filesusr.com/ugd/dad7b5_b3cefad75ed74a5081bff91607b62c2d.pdf?index=trueIn 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_off000103e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E1 5712 bytes
SHA-256: 64688b176c211db772764c0a3fff41be62b2472ca11c519597e9312bedb3777f
font_01_sfnt_off0001176f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176F 10700 bytes
SHA-256: 76865e583e74b7b90a5f9fc1c1e90142a8269a80da350b80ca5e38988f7ff6d5