Malicious PDF — malware analysis report

Static analysis result for SHA-256 9727c73e1b6eadf1…

MALICIOUS

PDF

73.4 KB Created: 2021-03-16 07:53:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: c3b962ebdfb2ff9e49323c31a9be8db2 SHA-1: 66e9fd3b310f32553262bf1337195fcdf32a2a69 SHA-256: 9727c73e1b6eadf1a026e6bc8ee5f591362ad0fb2ee394bb89f10d931a37438d
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF document contains a lure for remote support tools, instructing the user to install or connect with such software. It also functions as a link farm, directing users to numerous external PDF files hosted on disposable domains, likely to distribute further malicious content or engage in SEO manipulation. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with phishing and trojan activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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 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.
  • 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://jacksth.ru/aws?utm_term=how+do+i+find+my+remote+access+code PDF link annotation
    • https://viberizenuge.weebly.com/uploads/1/3/1/8/131857204/1039502.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383797/normal_5fcc4a357e8c0.pdfIn PDF document text
    • https://kafunonedejo.weebly.com/uploads/1/3/4/6/134662894/vedotowukidip.pdfIn PDF document text
    • https://nisaxiguxizi.weebly.com/uploads/1/3/5/3/135306566/593697.pdfIn PDF document text
    • https://soxoxalumowaju.weebly.com/uploads/1/3/4/7/134768556/38c9fe81f2a85fa.pdfIn PDF document text
    • https://jowadukezivi.weebly.com/uploads/1/3/1/3/131379295/gutow.pdfIn PDF document text
    • https://jetireduru.weebly.com/uploads/1/3/1/4/131453335/fefuxafasogefirodebe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481518/normal_604aa7e2b3c06.pdfIn PDF document text
    • https://pewarefat.weebly.com/uploads/1/3/4/3/134361746/sevakesinuk-lokaxirotudi-sawonodaxeboko-xatozeta.pdfIn PDF document text
    • https://xufalawat.weebly.com/uploads/1/3/0/8/130814535/871584e8.pdfIn PDF document text
    • https://nusutaligufobam.weebly.com/uploads/1/3/5/3/135393176/43e8e2622a.pdfIn PDF document text
    • https://voberugupov.weebly.com/uploads/1/3/4/4/134496708/9478161.pdfIn PDF document text
    • http://fusekimutoxi.sportsontheweb.net/zeteberesurivagadodaxado.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://86a9da1b-0b57-4b35-a77a-523886b904cd.filesusr.com/ugd/0d9a50_24b7a01597904485895bc718d9863a01.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/106580e5-ff8b-4516-af66-c4d31492c6dc/semufogejagatuv.pdfIn PDF document text
    • http://memepev.myartsonline.com/goat_days_benyamin_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21ebecf8-9708-477a-a992-0ca9be6cca8c/buy_sole_f80_treadmill_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fba569a-0051-4e89-a91e-4f7f71219a68/jogezivavipodog.pdfIn PDF document text
    • https://d3dd75b0-514a-4dbf-a1f7-973a5b421fb1.filesusr.com/ugd/5b46ec_bd268bd35b47436d98bcf8b67bf48467.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/38c48b1f-7d59-4b6f-acea-79d8e2508d76/last_sacrifice_book_summary.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_off0000df20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF20 5288 bytes
SHA-256: 8605fb38e2d7c82a7f04991720d62b12ff4582a4c9e4cc6d39ecff715cab1968
font_01_sfnt_off0000f11d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11D 11108 bytes
SHA-256: b95de848b6bea807ef3a7780eeb223709d79cff24f3d47ff7ac34e2376ba5bca