Malicious PDF — malware analysis report

Static analysis result for SHA-256 84c634606ea65fe2…

MALICIOUS

PDF

83.7 KB Created: 2021-09-19 17:11:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6c03c04df6eaffd3147c516d301e3615 SHA-1: 4300c305d8d6ee4a9eda6bca8d10ea11dc0e52f1 SHA-256: 84c634606ea65fe2d8d81170e78f30df356896a437de68fd7dfc82f8c290ddf6
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous links to external PDFs hosted on disposable domains, suggesting an attempt to distribute further malicious content or conduct phishing. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a deliberate effort to obscure the true destination and potentially evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://kop-trans.pl/uploads/userfiles/files/47317422635.pdf In PDF document text
    • http://telegid.tv/userfiles/file/73674593742.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/16320201880.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/12779567974.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/81898534718.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/65096848010.pdfIn PDF document text
    • https://adci.vn/data/upload/file/sopoxolatabewukoxotox.pdfIn PDF document text
    • https://superiorservicesandsolutionsfl.com/nbloom/fckuploads/file/kapefajikixane.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/89212129767.pdfIn PDF document text
    • http://nwatchonline.info/userfiles/file/6233619309.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/xudimixefazale.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/0c898c8c608537943c80ae4ef4534e6a/77633797448.pdfIn PDF document text
    • https://gestcargo.com/uploadfiles/file/98250810897.pdfIn PDF document text
    • http://slsnn.ru/content/files/jajupu.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/31723800064.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210901124219.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/78135908139.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/juzopuv.pdfIn PDF document text
    • https://impactmediaresources.com/userfiles/file/37603774963.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/wogupo.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/2659085327.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/939e9270d46127633a72df005851e8d1/sizujozugolekodit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=is+torrdroid+app+safePDF 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_off0000e0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C5 18760 bytes
SHA-256: dadbbb07bdfc78fe4ac9ffaf88c1ffb8ad1ba2abc9490a9b7e237dfde30b526d
font_01_sfnt_off000111c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C6 10292 bytes
SHA-256: 139124610b21e3425f1a35a7954a956fea8157288408288fadb5217d3a9de4ac
font_02_sfnt_off00012911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12911 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1