Malicious PDF — malware analysis report

Static analysis result for SHA-256 d84fb12fb75eaf33…

MALICIOUS

PDF

70.2 KB Created: 2021-09-26 02:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b11ba5eedfca4f2a1d06a600714d3116 SHA-1: 0f69b2127c59fd7599d0fd774311aab3b65290e9 SHA-256: d84fb12fb75eaf3317cff353236b6b06ca3f5348a82a8b91af71442e5bb56efd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable domains and appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent, such as phishing or malware distribution, by redirecting users to potentially harmful sites. No scripts were extracted, but the structure and URL patterns strongly suggest a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://laborke.ru/uplcv?utm_term=insta+xtreme+apk PDF link annotation
    • http://walosports.cl/userfiles/file/57099381905.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16148f9e36d0ad---fawigugaturuleziboladar.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/86017701378.pdfIn PDF document text
    • http://www.moyekolodin.com/files/sanesofuxafukukodavo.pdfIn PDF document text
    • https://zahidnawaz.com/UploadedImages/image/xijaregaxodug.pdfIn PDF document text
    • https://shunnasato.com/pumuxepaxokasewo.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/kumusimubemit.pdfIn PDF document text
    • http://dentherapia.hu/files/file/sovujigodajudasukixudakez.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/walur.pdfIn PDF document text
    • https://st-stephens-church.com/upload/File/46719898204.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/26513904611.pdfIn PDF document text
    • https://estoniapools.com/contents/files/77448041191.pdfIn PDF document text
    • http://thepducphat.com/upload/files/pidixotikifesufaz.pdfIn PDF document text
    • http://vinabomi.com/uploads/userfiles/file/tomimixa.pdfIn PDF document text
    • http://ufcnagykanizsa.hu/userfiles/file/39967362031.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/geledis.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/13965832907.pdfIn PDF document text
    • http://allier-genealogie.org/File:/21269488954.pdfIn PDF document text
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/bevuw.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/kujejifudelinozutozefidi.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/vebagonirotufuvavorawu.pdfIn PDF document text
    • http://synfarm.com/upload/files/doxunonerovenola.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/63489026972.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_off0000b1a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A9 16664 bytes
SHA-256: 2f0154a39e9425aac1dd9c57b4f8c115171da886668e59770d0461120b00c6dc
font_01_sfnt_off0000dc63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f47a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47A 10300 bytes
SHA-256: 3817c3d56e2338800f66acdc2c926525bda56ca798a4cef12f2d144aa60e2191

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