Malicious PDF — malware analysis report

Static analysis result for SHA-256 c48e6642da893c44…

MALICIOUS

PDF

87.7 KB Created: 2021-09-24 12:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6c6087e6f2b1cfce7fbcfb9dce21811d SHA-1: f389fefcf0142b400c30b97e7bc147b0559b6147 SHA-256: c48e6642da893c449b7fa7622f8e50fbe298c957f9e1e067455f5f35b866cae1
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier returned a high probability of maliciousness. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, a common tactic for tech-support scams or credential harvesting. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it may contain malicious JavaScript or exploit code to facilitate this lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://stijsr.com/userfiles/file/tagipimeli.pdf In PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614988c5dffd6---49939174272.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/26555786844.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/96219167154.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/fexuvojekutejad.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/61773965376.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/wavaka.pdfIn PDF document text
    • https://izometal.net/mm/file/wudafusoser.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/18982243191.pdfIn PDF document text
    • https://tmtteks.com/files/4617945945.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/babidojuzikujawim.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/kedazajewug.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/bizufitinikezovuziwibi.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/25254849889.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/legododufidaxifutifupiraw.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/muxixuvepovagigem.pdfIn PDF document text
    • https://paradigma.bg/uf/file/10396602730.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/8101746513.pdfIn PDF document text
    • https://toscanafantastica.com/userfiles/file/vujozejodakagekipax.pdfIn PDF document text
    • https://sharks-cz.cz/images/file/12157116589.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/lazelevisavepurojerek.pdfIn PDF document text
    • http://jvmont.eu/userfiles/file/vobuboj.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/70460678333.pdfIn PDF document text
    • http://houselandia.ru/files/5078659299.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=windows+mobile+on+android+devicePDF 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_off0000f0e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E2 10716 bytes
SHA-256: d3932811ec59234bb2d55effa1da0056220a51a44981953559afec24177d9f39
font_01_sfnt_off0001097d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001218f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218F 18232 bytes
SHA-256: 8a5a31a07fc261f95d01ae209ae470113249998b9e6197420bed1447817c78fc