Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8a497a2f91d3352…

MALICIOUS

PDF

70.3 KB Created: 2021-09-27 07:06:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 97607792f40456a319ba78953ef964d3 SHA-1: 7ed4fe6ba5e8dd759e2618f215d9bdffa666862a SHA-256: f8a497a2f91d3352c94df2bc1c4b44ebbc82e2162243b70caca893940cb54861
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm and a callback phishing lure. Although no executable scripts were extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious sites or initiate fraudulent phone calls. The presence of numerous distinct hosts and UTM parameters in the URLs further supports the phishing and link-farming nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • 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.
  • 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 http://togclick.com/media/userFckfiles/file/82101530106.pdf In PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/59669004231.pdfIn PDF document text
    • https://laps.pl/userfiles/file/sotevizegutusokitofa.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/luxewoxemez.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/80345091501.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/35224178424.pdfIn PDF document text
    • https://highrise.pl/file/75322511897.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/53993534035.pdfIn PDF document text
    • https://jdconstinc.com/ckfinder/userfiles/files/nuxuxavurubibulezesebez.pdfIn PDF document text
    • https://quangcaowebsite.xemlaco.com/uploads/files/miwepifomelu.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/legixupamafamovufofubofog.pdfIn PDF document text
    • http://purel-biopharm.com/upload/files/8168530348.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/1278537376.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/demasipuzemodef.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/zelawoxoxuzesotupe.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/19995753024.pdfIn PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/fulamowemiwagerujife.pdfIn PDF document text
    • https://salwangurugram.com/files/fulezonirobizubebenela.pdfIn PDF document text
    • http://krasneclanky.cz/uploads/55375755315.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/suwuto.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/2e69e2e9b6a2aaf94dc00f6e37cf873b/zisuferizegoloko.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/tegiwerudedexusosiwu.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/92974512436.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/bodemumimogox.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/18164743208.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/13249840265.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=8+ball+pool+free+coins+hackPDF 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_off0000b430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB430 10820 bytes
SHA-256: 714ad3ba226397c43827555ea103b1f4b59bc6807b1938dd0b6a679ccc1cc4c1
font_01_sfnt_off0000ccc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC0 15396 bytes
SHA-256: 751d0c2adb95ff4192961aa23d396921a82524cd2ab8ec5a66bde5c270d2e841
font_02_sfnt_off0000f35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1