Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2fd32bfbffa44f7…

MALICIOUS

PDF

80.4 KB Created: 2021-09-13 18:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bf0af1998bcaa99be09f1080a48aaf13 SHA-1: 64ca4edf82d6e4060312adb8198efceb471cb6bf SHA-256: f2fd32bfbffa44f7ae5f7039f07e7ee164cbd615c27e03acd468bc50cf6dd72c
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as 'Pdf.Phishing.Trojan' and flagged by an ML classifier with high confidence. Numerous embedded URLs and a heuristic indicating a link farm on disposable hosting suggest a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395b99646ab---5198471396.pdf In PDF document text
    • http://amirafouad.com/uploaded_files/file/buzopezazogexo.pdfIn PDF document text
    • http://phuongsen.com/img-chamthi/files/rosodikevizenuzam.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/fenetegivimevisenak.pdfIn PDF document text
    • http://www.sudeshnamaulik.com/fckimages/file/76975645000.pdfIn PDF document text
    • https://turasmobilya.com/img/editor/image/file/74131977376.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/pitawedizudumadurajupo.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/piguxejowes.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/buribogibasazejelezisinup.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109062122085957.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109102205489278.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/galodarig.pdfIn PDF document text
    • http://poliinc.com/upload/files/36053801285.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/92747849386.pdfIn PDF document text
    • http://garankuccu.com/upload/fckimagesfile/9ea15649eca037385ed27c719f1fd551.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/tiwafibubo.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/xiseruzefakumile.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/vetufidogunedujuli.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/20219111019143928.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/26c3f42a6d9b4f24301e5f11198de8c6/fikilorukidis.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/lelawatug.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210906_2616E8F20A44A134.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=most+installed+game+on+play+storePDF 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_off0000d5ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EA 10840 bytes
SHA-256: 46af454bd430033ef6283e7f8da052f94e24488cf7349ec8f43f216408e5490c
font_01_sfnt_off0000eeb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C5 17572 bytes
SHA-256: 172bc1c197b9e6a1b596f3ffb666cc2bfdec541dc87cf0372c8be2f5b1a1d223

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