Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfaa38e40b95f416…

MALICIOUS

PDF

77.2 KB Created: 2021-09-18 12:13:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a8dfc4802934b20e55fbd6f692bc44b5 SHA-1: 77802f3490d64106628f27c189ac6b4afe7a718a SHA-256: bfaa38e40b95f416c95f1a122369b0e341935ae07bc72e38ebf72e0dcb6d7e93
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by multiple engines, including ClamAV and an ML classifier. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, a common tactic for phishing or distributing further malware. The PDF structure and embedded URLs suggest it is intended to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • 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://huntic.ru/uplcv?utm_term=top+5+phones+under+20000+in+india+2020 PDF link annotation
    • http://wxhsbl.com/ckfinder/userfiles/files/20210906_212403.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/14053244676.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/weriwagenewowatafezop.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380cc9e2de7---lonogiwaseba.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/gugesajup.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/27726163244.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/2375034637.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/32617963269.pdfIn PDF document text
    • https://sananselmo.com/wysiwygfiles/file/74094912062.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/56707688107.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/sarofusagelononum.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/37800118759.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/konedunumo.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f264b55e2a---33139118420.pdfIn PDF document text
    • http://myarrahnu.com/mo_images/files/15645408731.pdfIn PDF document text
    • https://casartigianiudine.busletter.it/ckfinder/userfiles/files/55750470249.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/16031907543.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/rolamafopakagojapo.pdfIn PDF document text
    • http://polipack.ru/content/file/jeginupawamowaludujozoru.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/tatiwidedirovirinubelareg.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/temapuxesajerekov.pdfIn PDF document text
    • http://abcs.umontreal.ca/upload/files/tavipinofobata.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_off0000ca86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA86 10784 bytes
SHA-256: 4d66936f55100332ca1a9438762d65a3838ceb988842737d9a87a13b6007c6cd
font_01_sfnt_off0000e350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE350 16888 bytes
SHA-256: 68cce5c0fd3ec63181b30873d9918e0f2aa8927f08ee4982a5dce65c2ba6c738
font_02_sfnt_off00010eef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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