Malicious PDF — malware analysis report

Static analysis result for SHA-256 18a126a33ae3f5d4…

MALICIOUS

PDF

82.1 KB Created: 2021-09-18 12:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: bba7a3f4cbfa9ce12bcfcf60823cc588 SHA-1: 4a81163bfbe207340dadee8e9124a99bb1ee5c17 SHA-256: 18a126a33ae3f5d4703c74a3625c2dd726e17b5f99633d8e5b3a50b9fc0e8b1f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=pokemon+fire+red+hack+catch+all+pokemon+download PDF link annotation
    • https://etcbt.com/userfiles/file/90598248532.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210903_E1799E508663C24B.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/99844870564.pdfIn PDF document text
    • http://artio.pl/files/files/21730006858.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613485cb4f096---1539296453.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/5045965429.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/69900546728.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/jofamefitaxapuv.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/kalodubowurego.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/sekasobozakusorajifetizu.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/turodogozu.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/45412795063.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/23510405849.pdfIn PDF document text
    • https://maisonforville.be/documents/file/48756448656.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-18/20210918154903741164.pdfIn PDF document text
    • http://denge.aero/upload/files/98533447641.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/93786827670.pdfIn PDF document text
    • https://citronel.com/userfiles/files/taxexapimojanupagupakepu.pdfIn PDF document text
    • https://vnjhanoi.com/upload/files/32538824436.pdfIn PDF document text
    • http://merwepizza.com/upload/file/50732629324.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210913_1138EC44EDF6D63C.pdfIn PDF document text
    • https://goodline.by/userfiles/file/85070230889.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/99639757181.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/rewikisolelem.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_off0000dbcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCB 10896 bytes
SHA-256: 8063717b89207801889407e70a1e5f32bc7378f164505934c14f85ba3cc9bffb
font_01_sfnt_off0000f4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D7 17608 bytes
SHA-256: d2e6e4b39c1ceae9b927ca56312825871ec25124841bc8be913b81242fd29091
font_02_sfnt_off00012291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12291 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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