Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccb16b68621296f5…

MALICIOUS

PDF

77.2 KB Created: 2021-09-10 10:42:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 272bab38991e7d29c6984ae3f49c5f2f SHA-1: 432b9bd88c68a99a9ade1dbdb67739e33eeb06fb SHA-256: ccb16b68621296f5f9ce8b8601386ade8e635b0657fed54d162f65fc9e9b3964
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://smidgel.ru/uplcv?utm_term=connect+my+phone+to+pc+wirelessly PDF link annotation
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c01b1a36e---6987803260.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210908_AE912B621700115F.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/jamuw.pdfIn PDF document text
    • http://zonwering-nederland.com/ckfinder/userfiles/files/dusisoburipowegat.pdfIn PDF document text
    • https://markaoyun.com/calisma2/files/uploads/91315744225.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/sululopuvabuwen.pdfIn PDF document text
    • http://marymo.ru/uploads/files/wusabakisejowodetumof.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/63340751558.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/begigukolojoxib.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/bowoxatokosos.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/67891837832.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/94485306053.pdfIn PDF document text
    • http://3sdent.com/upload/files/xejomuditofonero.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/bokoragamukefaxus.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/acc51c87652503c8a0d7ca1b0be10ce2/20194776446.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/8839693310.pdfIn PDF document text
    • http://akcompany.vn/uploads/userfiles/file/14714761523.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210903090508.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/gilotigavo.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/sogukatofuj.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/tukunurazuvavipop.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/zezerirejujovasipelewur.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_off0000c89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC89A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AC 17968 bytes
SHA-256: 8060a1a0fc2f1765aad8af3f6dc30528a6b169309965cca15d91b3e9c743be79
font_02_sfnt_off00010edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDB 10708 bytes
SHA-256: e7575bd8f17ba5abf5b6f37441fd637b828f9bbbe854e3f66a4f3627a6c5c101

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