Malicious PDF — malware analysis report

Static analysis result for SHA-256 6320a00a9464131c…

MALICIOUS

PDF

85.9 KB Created: 2021-09-17 21:14:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 65e366b6d3a7ec49da1296cf30b7c2e4 SHA-1: a062c157b4d809aaeef570245ed0c049660a76c7 SHA-256: 6320a00a9464131c2cdb7464188810285de17ca6a7a36d9c5474e29cc4bdec77
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by multiple heuristics as malicious, including ClamAV detection and an ML classifier. It contains links to external PDFs, one of which uses an IP address, and another is described as a link farm on disposable hosting. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or tech-support scam context, indicating the document's intent is to deceive the user into interacting with malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://www.agencesramos.com/ckfinder/userfiles/files/97248422494.pdf In PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/vimerewoxij.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/wesomesi.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/73514206700.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/29654467951.pdfIn PDF document text
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/92045164315.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/9054720523.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/13993347942.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/sasalato.pdfIn PDF document text
    • https://inwestorfinanse.pl/userfiles/file/babaxel.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/37350078264.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/nofufukekemu.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/gotokazafupimiwetokolaf.pdfPDF link annotation
    • http://batterseataxi.com/survey/userfiles/files/gulavurotejapex.pdfIn PDF document text
    • http://partnercable.com/files/zigopevazabagipoluzufeb.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/4103072373.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/31772751606.pdfIn PDF document text
    • http://atek-ent.com/upload/file/dexorinudevafubesobomu.pdfIn PDF document text
    • http://hjhchem.com/upload/files/10201421623.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/xonutoko.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210905211233.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/40533259584.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/fuxazerasupilagakunanukug.pdfIn PDF document text
    • https://kawanmto.net/contents/files/nisemapoweli.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109131805195331.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=where+can+i+find+my+phone+number+on+my+phonePDF 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_off0000e595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE595 19860 bytes
SHA-256: b636b88a8309fecf4791e40ef32b04711ea788aa2fc538704eb1c60bb2fa6e3f
font_01_sfnt_off00011904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11904 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001311b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1311B 10920 bytes
SHA-256: 15dde6e6c5d018b02aca599b3cb7213f28dda4665e2766325c9cd0e9b4540c09