Malicious PDF — malware analysis report

Static analysis result for SHA-256 7644131c7b061d40…

MALICIOUS

PDF

74.5 KB Created: 2021-09-16 08:56:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 00f5f55b9ff89d9695022d3677e4d497 SHA-1: 5149721a275e498d666c90af00fbb388a9f3ec28 SHA-256: 7644131c7b061d40aa3a180308210fb927e1c52822bac7831c8745a8c5e92eff
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm designed to distribute malicious content or phish users. Heuristics indicate it's a link farm on disposable hosting and a callback phishing lure, suggesting an attempt to redirect users to malicious sites. ClamAV detection further confirms its malicious nature, classifying it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://philabc.ru/uplcv?utm_term=clash+of+clans+hack+ac+market PDF link annotation
    • http://gaudi.tw/upload/files/15627908715.pdfIn PDF document text
    • https://ms02bet.com/contents/files/67830363269.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/bokabajiso.pdfIn PDF document text
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/49433337256.pdfIn PDF document text
    • http://stl-hk.net/userfiles/96305136396.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/nukapogofiruvonifo.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/dafaxar.pdfIn PDF document text
    • http://jfe.hk/userfiles/fixajepis.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/20803953994.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/77b4f81a11b315e6ee8820939574119b/89634848695.pdfIn PDF document text
    • http://megamento.com/_UploadFile/Images/file/22711155012.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/dusiridugurazilaxek.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/81812449674.pdfIn PDF document text
    • https://geloracinta.com/contents/files/xovomavoloranixuzigap.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/papujamugovoleku.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/zifatasitetupafarizel.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/ae8d987690a4521c9099a1cdafef774b/39669216143.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/28315300269.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-9/20210909165309228308.pdfIn PDF document text
    • http://julianina.dk/upload/file/71593904044.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/87437421281.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_off0000c091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC091 10632 bytes
SHA-256: 5c73d4723a2306b6784f34b2c4b2631f540d4200abd6097d78694da65a9ffce7
font_01_sfnt_off0000d8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D6 16988 bytes
SHA-256: e2b875a707a4dcf370a08894dc0ad0be5b26d8fa36a15f80dd45af4d998d04bc

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