Malicious PDF — malware analysis report

Static analysis result for SHA-256 040b0ec3edcb1785…

MALICIOUS

PDF

80.8 KB Created: 2021-09-13 09:01:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 039808f99f0f689d2fff637b94d74ec7 SHA-1: 265bc8a0e49034d6889181785ceaac9a2148f233 SHA-256: 040b0ec3edcb17856efbaaecbd2e88377d37cf20f993f8f3f82e9851cf43699a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The sample is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. Specifically, it presents a callback phishing scenario, prompting the user to contact a provided phone number under the guise of resolving a billing, refund, or security issue. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to exploit vulnerabilities or redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://ahirealty.in/admin/userfiles/files/lonirefapunebiboxujeda.pdf In PDF document text
    • http://111-orte.com/testarea/cwsCMSlight/media/files/texafufovinikaxinosafafi.pdfIn PDF document text
    • http://wirheiraten.de/images/file/zebiwunusabu.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/mixuxogaleritufijozitapo.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16133bf156f92e---19236467879.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/16640992201.pdfIn PDF document text
    • https://vitanov.rs/files/sokowafunotokolegulijek.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/51104096458.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/fufoxusilinokitiluzeva.pdfIn PDF document text
    • https://atrax.eu/userfiles/file/92764602959.pdfIn PDF document text
    • http://surtek.biz/image/files/20150320_124340.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/40869185985.pdfIn PDF document text
    • http://zerosquareonline.com/file/japedirivukulenijakireg.pdfIn PDF document text
    • http://snabsz.ru/ckfinder/userfiles/files/42654521866.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/zupenabetiseresipen.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/mividajutejudatitodit.pdfIn PDF document text
    • https://mptradingcompany.com/userfiles/file/konatotubusetusavoxo.pdfIn PDF document text
    • http://arsvet.ru/img/upload/wakuban.pdfIn PDF document text
    • http://mp-journal.com/media/file/41154406940.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/47701406246.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/3a56f81726045b7f04908040522344bb/80860132683.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/7210682835.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/foroxezivojapax.pdfIn PDF document text
    • https://iohrp.org/f_files/files/darovolifi.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/28034268336.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/gireguwisalurititusepi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+delete+telegram+account+from+another+phonePDF 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_off0000d765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD765 10984 bytes
SHA-256: e437707c1926350b7270701f9d2fd8b7f4632c0eadcd34828841fd9ed929fcdc
font_01_sfnt_off0000f08a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001089c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089C 17032 bytes
SHA-256: 387924612862944e597fc0e4978aba9f2ac85767f74c13fe99b8431dcd16b8c2

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