Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf9d634fc495487c…

MALICIOUS

PDF

78.3 KB Created: 2021-06-12 07:13:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6cd0c6077979e74531249090edc407a SHA-1: c8f9f3d278c59e9863fc402751ac4f40df025066 SHA-256: bf9d634fc495487ca937833d79ba4593b2f28cf617301c6bce329ff91f8139de
226 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm designed to redirect users to potentially malicious content, as indicated by multiple heuristics and a high ML classifier score. The document's structure and embedded URLs suggest an attempt to disguise malicious activity as legitimate content, possibly leading to phishing or malware downloads. The presence of a remote-support tool lure further increases the risk, suggesting a pretext for gaining unauthorized access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://chcial.ru/pbw?utm_term=five+nights+at+sonic%2527s+2+apk+android
    • https://vadalafazewa.weebly.com/uploads/1/3/4/8/134897988/zobosuniri-jepusejilifi.pdf
    • https://dibufasefeduvit.weebly.com/uploads/1/3/5/9/135975636/5d1daac1f6f7088.pdf
    • https://fewefemuge.weebly.com/uploads/1/3/4/3/134372507/xujagusulaxowoku.pdf
    • https://fixabewol.weebly.com/uploads/1/3/4/7/134711766/lupomewumulub-wejilivawaxolin.pdf
    • https://cdn-cms.f-static.net/uploads/4489853/normal_6031dfdc2625f.pdf
    • https://static.s123-cdn-static-d.com/uploads/4443578/normal_60afe8618cedf.pdf
    • https://takaranedo.weebly.com/uploads/1/3/4/0/134017801/kojik.pdf
    • https://cdn-cms.f-static.net/uploads/4403672/normal_60531c577c9be.pdf
    • https://ninisezidopif.weebly.com/uploads/1/3/5/3/135391617/ropoludaki-lovun-kuwarixarimup.pdf
    • https://lunidopufakim.weebly.com/uploads/1/3/4/4/134482460/nubofuxewukatirokowo.pdf
    • https://towizitubozabo.weebly.com/uploads/1/3/5/4/135400713/5381275.pdf
    • https://cdn-cms.f-static.net/uploads/4421460/normal_600c3a2cb1aea.pdf
    • https://static.s123-cdn-static.com/uploads/4408862/normal_5fc91339af5c1.pdf
    • https://padilokemim.weebly.com/uploads/1/3/1/3/131381900/wifegopumozeneg.pdf
    • https://lefilima.weebly.com/uploads/1/3/0/7/130775934/fatinebebu-dezosimerepo-zalox.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/96bc59b0-83e6-4b39-94ec-89b04bebbab4/where_can_i_donate_clothes_in_nj.pdf
    • http://siseraxoru.pbworks.com/f/adobe_flash_player_download_for_firefox.pdf
    • https://uploads.strikinglycdn.com/files/6b5cee8d-5108-4c5f-8c86-988363615e9a/how_to_put_tracfone_on_speaker.pdf
    • http://gujavitax.pbworks.com/f/wazumofona.pdf
    • https://uploads.strikinglycdn.com/files/db21a02c-1dce-49bd-907b-9cd39501f4b6/notutifak.pdf
    • https://uploads.strikinglycdn.com/files/bbfc4ab5-dd21-4516-9cac-421e3448c4ad/automatic_control_systems_9th_edition_trke.pdf
    • https://uploads.strikinglycdn.com/files/783db4b0-a670-4094-a9f5-23ed686adc9c/1376188044.pdf
    • http://ropotupi.pbworks.com/f/54428975741.pdf
    • http://garewewaziwu.pbworks.com/f/89021906604.pdf
    • http://doxawadar.pbworks.com/f/economia_internacional_krugman.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f050.bin
800383815062f326c206e4129d6f1a45848c589f0b607e0dfe5cace1f16c358c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF050 5548 bytes
font_01_sfnt_off00010344.bin
b4d2492a70455940885f66ccb5fc0523974c79e7561e80bab6287413b80546d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10344 11732 bytes