Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a26f30bd2f37f40…

MALICIOUS

PDF

76.5 KB Created: 2021-09-18 09:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6d43740bb699c9d9a35e0bdd8acf5e44 SHA-1: 678ac63dc877b8b1d17d55f9109a0df2756e15cd SHA-256: 6a26f30bd2f37f40ac692015d709d7cbb4875662df2fdb259f53bac03e2311d3
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

The PDF contains numerous embedded URLs and is flagged as a link farm, suggesting it's designed to redirect users to malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass security scanners. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics confirm its malicious nature, classifying it as phishing or a trojan. No scripts were extracted, but the overall structure points to a phishing attempt using external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://inwebjor.ru/uplcv?utm_term=android+spinner+dropdown+style PDF link annotation
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/kadubenodi.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/kevexulodavevor.pdfIn PDF document text
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/sogidolunezemi.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/26164525163.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/27937977799.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/28993261558.pdfIn PDF document text
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/73466972710.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/teziwabidowesutazudodob.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/77747827802.pdfIn PDF document text
    • https://molecult.metallo-tests.ch/sites/web/upload/files/80536983196.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/dutelimarubifizuvon.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/fonaxigeril.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210906070256_kuvd36.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/bakinor.pdfIn PDF document text
    • https://msvadba.ru/files/file/guxiravemugijazoju.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210908055841.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/lezarazunifixo.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/fuxosopumonagojewofapev.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/13957182556.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/4399887950.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/355555433.pdfIn PDF document text
    • http://taigesw.com/upload/files/22750899289.pdfIn PDF document text
    • http://adgroup.co/userfiles/file/14500565678.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/a21404bbc5432dfa96800472780479a3/85583243942.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/sakewoxudozaxu.pdfIn PDF document text
    • https://arerp.kr/data/file///81706722033.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_off0000c678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC678 17472 bytes
SHA-256: fd549201c74f86c8262e8a1ead2ecadc26b4624a72e720515e68421d77f6ee4a
font_01_sfnt_off0000f441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF441 10404 bytes
SHA-256: ad3eadd6f4d01d0d3f76751c976d90ad8738520e8a4d3f13f0629d9ef39ed3b8
font_02_sfnt_off00010c02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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