Malicious PDF — malware analysis report

Static analysis result for SHA-256 20d1de28654786cc…

MALICIOUS

PDF

73.9 KB Created: 2021-09-14 02:54:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 677bd6aa794754ea87a46c2926dc0b2c SHA-1: e10011486a2316837ea20c7bbf69fff55974e220 SHA-256: 20d1de28654786ccf612922efba4a2b12cbc8b0bcffda6a864dbb86147b20033
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or SEO poisoning attempt. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a high number of distinct hosts and links, reinforcing the malicious intent of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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 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 http://appinaris.net/ckfinder/userfiles/publics/files/99022026203.pdf In PDF document text
    • http://tccsrl.org/userfiles/files/69687305114.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/93899196161.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/sixazanefakul.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/17436573802.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/xetezelajadafa.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/64117249666.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/11885742063.pdfIn PDF document text
    • http://abnicum.ru/files/file/99510213919.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/wekakemuw.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202109060550466507.pdfIn PDF document text
    • https://duragloss.pl/userfiles/file/memijosulopadikugejemob.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/44419104661.pdfIn PDF document text
    • https://rafautama.com/uploads/file/32617490643.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/53142261599.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/lezuginokigasenutulufo.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb94929fac---41607819208.pdfIn PDF document text
    • http://candientushinko.com/images/file/jekituxu.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/40835970230.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613879434ef17---funifigiwisimigax.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/gexuluke.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/mozibamemanusuxifimip.pdfIn PDF document text
    • https://tcremich.lu/files/files/xozomuda.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///nekum.pdfIn PDF document text
    • http://starma.pl/files/file/64318771662.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=gangster+mafia+mod+apkPDF link annotation
    • 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_off0000bcc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCC5 17004 bytes
SHA-256: 51c55cd627ec62b30533521d551aca04581dad6970bd9a3b81a3e6a7775eaa2c
font_01_sfnt_off0000e89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89A 10924 bytes
SHA-256: aaec722db83933e3bc0f660405a6200401c42692ca99e3466ba22a640187d8a8
font_02_sfnt_off000101c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1