Malicious PDF — malware analysis report

Static analysis result for SHA-256 adf3dc80d5f15e31…

MALICIOUS

PDF

89.7 KB Created: 2021-04-02 22:22:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 796c7138b297dc7d2508085de8899d07 SHA-1: b2154f2443b035533b02fa18b52c6ac54246c7f6 SHA-256: adf3dc80d5f15e3139b0f825f7dca0d2c9d492a6218c8bd4e312180b8e88efd8
194 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm designed to distribute malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern. The primary goal appears to be directing users to download a secondary payload from one of the numerous URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jacksth.ru/123?utm_term=a+n+m+online+form+2018 PDF link annotation
    • https://cdn.sqhk.co/lilodipu/jhxhiJB/kaxoveperekiguzokexogase.pdfIn PDF document text
    • https://zofijakifixanow.weebly.com/uploads/1/3/4/6/134677560/8505186.pdfIn PDF document text
    • https://xogukozatakik.weebly.com/uploads/1/3/1/4/131453421/migijo_veputu_xogukuk_wikagosasoxaxex.pdfIn PDF document text
    • https://cdn.sqhk.co/tegatiwuwax/ijegcih/bioshock_rapture_john_shirley.pdfIn PDF document text
    • https://cdn.sqhk.co/linewebozid/geKebLR/66609473828.pdfIn PDF document text
    • http://inmyshtangen.xyz/lowes_charitable_and_educational_foundation_grant_application2fxk5.pdfIn PDF document text
    • https://nasotatuji.weebly.com/uploads/1/3/4/3/134392375/4924899.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxofidipo/fjbqygd/pet_paradise_resort_bartram.pdfIn PDF document text
    • http://save50it.info/are_old_readers_digest_books_worth_anythings9n1k.pdfIn PDF document text
    • https://vabudefun.weebly.com/uploads/1/3/0/7/130775589/folas-funetatokamim.pdfIn PDF document text
    • https://pezofonarumupub.weebly.com/uploads/1/3/5/3/135396673/7617543.pdfIn PDF document text
    • https://cdn.sqhk.co/gitesafuwu/7jaUgbY/rearrange_pages_in_files.pdfIn PDF document text
    • https://cdn.sqhk.co/gizoxemovefi/cIWOgj7/under_the_map_glitch_modern_warfare_warzone.pdfIn PDF document text
    • https://cdn.sqhk.co/tumosirewuw/82hjBUf/torn_acl_in_dogs_symptoms.pdfIn PDF document text
    • https://cdn.sqhk.co/zutigaku/RjiBZIl/96525781621.pdfIn PDF document text
    • https://defavelusanopef.weebly.com/uploads/1/3/5/3/135345674/sirubujig-jibikitane-zedufat-tetibogo.pdfIn PDF document text
    • https://cdn.sqhk.co/nivunufozub/hcifLIb/39310751405.pdfIn PDF document text
    • https://kitetunevoneg.weebly.com/uploads/1/3/4/7/134703129/581c1608.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa0dadd6-7766-4a28-a80f-29ff80c2655a/char_broil_big_easy_turkey_injection_recipe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d9e8761-6f26-4b46-a176-e6bc4c015a0e/lenexezona.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43ef0fb7-97f0-4fea-ba4f-105d3ca25790/chamberlain_liftmaster_professional_garage_door_opener_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fad948af-9dbe-42ee-ac86-fc61eb4db0a0/what_does_inferential_statistics_involve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e999c4dd-bb9c-448a-9eb9-6c2f0ebea178/flowchart_symbols_easy_definition.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD41 5036 bytes
SHA-256: a1321d62437fb4c7bd7d865a1598d8bfac2aa25744c883e1e28c43539bbfa849
font_01_sfnt_off00010e53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E53 3720 bytes
SHA-256: 40ef96da86b6123d577d475be460de15c41b9ca7393a8e650be4e9942aa3c64b
font_02_sfnt_off000119b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B5 11108 bytes
SHA-256: d8ed754a7385bad738e6b9bef17dd3b2099320519525fa1ded3227f56e122338
font_03_sfnt_off00013fdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FDC 6864 bytes
SHA-256: 47cc1ab99bf5a25201a810a129503793c90223248eb16d1eb1f9a8e77aa7d0e9