Malicious PDF — malware analysis report

Static analysis result for SHA-256 7857db1fe5a9368e…

MALICIOUS

PDF

82.3 KB Created: 2021-09-14 03:19:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 67c9c0262a353f16cc89fb01d5b352bc SHA-1: 12ae6338524b50eaf4d7088c0aa2dd6045f56f55 SHA-256: 7857db1fe5a9368ebca1e1cb833d73d404a3bafaeb69a5aabdd8f9f2f982fe4d
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. The 'SE_CLICKFIX' heuristic indicates the document likely contains instructions to trick the user into executing commands, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://catamma.ru/uplcv?utm_term=how+to+turn+off+safe+mode+on+my+phone PDF link annotation
    • http://hvezda-pardubice.cz/files/file/wureteja.pdfIn PDF document text
    • https://birotex.rs/images/files/jajak.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/vovorobo.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/97002031951.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/22113924936.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/60200240152.pdfIn PDF document text
    • http://archive-2014.humandoc.pl/attachments/file/82614403228.pdfIn PDF document text
    • https://rockeit.com/userfiles/file/pixafirewalesuxugodi.pdfIn PDF document text
    • https://dienmayminhchau.vn/uploads/news_file/39552369288.pdfIn PDF document text
    • http://jawarakreasi.com/file/wufuxubefuwo.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/73279894530.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/gidijanajob.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/wofuxogelo.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109130453298576.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/17125153927.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/67551116683.pdfIn PDF document text
    • http://sinoorchids.com/image/file/xivinufiriza.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/deduwufema.pdfIn PDF document text
    • http://ukrfirework.com/images/file/dumopomi.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/72260758312.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/tukarezez.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/mofatolagekanowu.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF494 17812 bytes
SHA-256: e2b2b2522118543f3ea2517534bc9f80ba1dab588c467c42e0134fdcba23a24c
font_02_sfnt_off0001228e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228E 10916 bytes
SHA-256: 833df9f205b9500114cbf25fd615b0072538f09cea28cc7fe844020439b41a75

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