Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5c607d6cf242dde…

MALICIOUS

PDF

78.3 KB Created: 2021-04-18 22:21:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 85a2fb4206bec0d18b539e6262fd9cd9 SHA-1: 73322d43f1e3066238bccc00d705550b99dddb7c SHA-256: b5c607d6cf242dde3e81444d0888753740e0d7d4d691a85eb9a5075b63bb43c3
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 0.9992

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 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://dafemum.ru/strik?utm_term=sony+icf-cdk50+mounting+template PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378157/normal_600f73d126e64.pdfIn PDF document text
    • http://xtw2.club/20393351592uyut3.pdfIn PDF document text
    • http://saxosoxajivovud.medianewsonline.com/fokivoserenovuveru.pdfIn PDF document text
    • http://bulibujirifubof.scienceontheweb.net/johnny_appleseed_story_book.pdfIn PDF document text
    • http://pesale.pro/investigating_graphs_of_polynomial_functions_worksheetualfm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366007/normal_6065e93da05d2.pdfIn PDF document text
    • http://2020coupons.info/tulusoripekoraxubodozesizdx7p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453740/normal_6023d54a3dcd6.pdfIn PDF document text
    • http://xokodiraki.22web.org/82111262613.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403808/normal_5fcd563a4da85.pdfIn PDF document text
    • http://rinobozawizuvew.iblogger.org/jupitelebajinuk.pdfIn PDF document text
    • http://getveran.site/luminofuzas0ecof.pdfIn PDF document text
    • http://prod-fruit.space/the_book_of_birthdays_websited6xi5.pdfIn PDF document text
    • http://dewodalaluw.mygamesonline.org/92587501415.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://taguloxutenafol.myartsonline.com/geralt_de_rivia_bautismo_de_fuego.pdfIn PDF document text
    • http://letutemoxeluz.onlinewebshop.net/singer_toy_chain_stitch_sewing_machine_instructions.pdfIn PDF document text
    • http://nununad.myartsonline.com/saitek_x52_hotas_flight_control_system_joystick_pc.pdfIn PDF document text
    • http://balifajaxi.epizy.com/51682478873.pdfIn PDF document text
    • http://fekabama.epizy.com/junuvoleparukubetutikaz.pdfIn PDF document text
    • http://kixugafo.epizy.com/63548375112.pdfIn PDF document text
    • http://rowoniwetob.atwebpages.com/67929589729.pdfIn PDF document text
    • http://godidab.epizy.com/18464636715.pdfIn PDF document text
    • http://gukamapi.rf.gd/what_is_an_heirship_affidavit_form_texas.pdfIn PDF document text
    • http://putiremupupunis.epizy.com/safe_electric_test_record_sheet.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_off0000f03d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03D 5768 bytes
SHA-256: 67a33ee64b6fd8de821c70a54785349f6b675633057ccf716c5bdb624f4f70eb
font_01_sfnt_off000103f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F4 11856 bytes
SHA-256: 54e1092b4e22aca3a930c71d8b37fcc904853bff26a48eb1a0d3bae103755dab

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