Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7cf52e5215d2edc…

MALICIOUS

PDF

79.4 KB Created: 2021-09-13 18:05:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 85476f96efdfd180042f61622c3a4a59 SHA-1: 9f69850a6a46ba58a6e81f34dcd45176e6680b29 SHA-256: b7cf52e5215d2edc7bf4a9211f3b3f8d8fc2f502e789d1c387387bb5f04f5b51
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to a link farm, suggesting a phishing or SEO poisoning campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high number of distinct hosts, reinforcing the link farm hypothesis.

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://cissud.com/uploads/ck_editor/files/vegojufezupitobofotakib.pdf In PDF document text
    • https://maintogelonline.bet/contents/files/winib.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/3678935918.pdfIn PDF document text
    • http://c-amc.com/upload/files/54357843137.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/83260806658.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130b0b177a89---belazemotom.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/judow.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/joxejikolixetetagalojuz.pdfIn PDF document text
    • http://hebakotb.net/userfiles/file/66288261828.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/zedorejelexebuv.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es/ckfinder/userfiles/files/435141435.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/43345157546.pdfIn PDF document text
    • http://preiss.at/upload_files/files/xukomalutagoxewasetuvoji.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/28162972084.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/8cc1a5ebf5dd33e56b25e6abe9d86cda/runuvuzakoxilubaz.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/bawunupezenekazuk.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021090304465786.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/99090044316.pdfIn PDF document text
    • http://asfalon.com/__files/file/sefugaruxusowujeni.pdfIn PDF document text
    • http://radecznica.pl/userfiles/file/82575905117.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/ramiminegoro.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/60962373237.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/guveva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=little+arrow+on+iphonePDF 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_off0000d17b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17B 10224 bytes
SHA-256: 4b97f616ca38a9b9dfc7941592cb3062ef64969e336012dbaa1f62427055410a
font_01_sfnt_off0000e857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE857 18184 bytes
SHA-256: 2e6bf58a714b99313cb73d2dfe939b2cf0378ee29d4433a4f0e92e0220d5051d
font_02_sfnt_off000117fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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