Malicious PDF — malware analysis report

Static analysis result for SHA-256 283b4f3ae33cea9d…

MALICIOUS

PDF

83.3 KB Created: 2021-09-19 16:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7d6f5c444f4ce9f92c8e91afd45a9ed4 SHA-1: 1bf79e528220be32df2e11940e5b06eff499c5ac SHA-256: 283b4f3ae33cea9d67b647a28711a09d6b8901ec75c9052881ed729f301bda6f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic findings point to the document acting as a link farm, hosting numerous links to other PDF files, suggesting a distribution mechanism for malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://kazuma.ru/ckfinder/userfiles/files/56827758201.pdf In PDF document text
    • http://textstricker.de/benutzerdateien/4560270089.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/zavadiwipotiri.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210919170151.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/88042119786.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/zelabotoven.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/51138847165.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/4i7tbftov11vb4u72g45ob65g2/31311844995.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/3351056233.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/kebiretilezebefolekolala.pdfIn PDF document text
    • http://ilkjv.com/Images/Media/files/jafan.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/58265126084.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/59045951398.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/jiwutog.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/48926604072.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/veketofobaxuvifomijik.pdfIn PDF document text
    • http://wohingltd.com/userfiles/67110813512.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/zeleromaloxugalimunofozu.pdfIn PDF document text
    • https://mayersoffice.com/userfiles/file/vujuke.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/64857589740.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/62202587245.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/13232686059.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/44536864779.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=mudit+khanna+medicine+12th+edition+pdf+free+downloadPDF 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_off0000dd9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9A 18292 bytes
SHA-256: adb2177c97d03df98ad7549aaa588187ab721b11417027142c24e7d5ace5f7b1
font_01_sfnt_off00010d3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3F 11160 bytes
SHA-256: 151871b7e37ef83e4e826100bd2868bd0b6e3b4dee2a1d5b2fecf170c2b639f2
font_02_sfnt_off00012742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12742 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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