Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfa1042fac18209e…

MALICIOUS

PDF

74.7 KB Created: 2021-09-21 00:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: adbd2e8792444b51d17c99e81d2cdc5e SHA-1: c6101865be21b5ab0d3ebdc4d6ca043310ae2fec SHA-256: dfa1042fac18209e5f27fc051f98aa3f9ddad47319f9df9fb3143f3d33b472b7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and utilize UTM parameters, indicating a phishing or spam campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards it being used as a lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=rab+ne+bana+di+jodi+full+movie+online PDF link annotation
    • http://sccsfz.org/upload/2021-09/lovefozoluzotaras.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///govam.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/rabufupurotopunekofurule.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/fipigajivugiravudafev.pdfIn PDF document text
    • https://computerzone.pk/file/79219971596.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/52593138326.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/rulejedurusaf.pdfIn PDF document text
    • http://hydrem.ru/images/file/18885312357.pdfIn PDF document text
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/85818337100.pdfIn PDF document text
    • https://decisionstogo.com/fck_image/file/vivemidezevitavu.pdfIn PDF document text
    • http://jogagongu.pl/userfiles/file/fidazid.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59699864900.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/46466806401.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/82204213982.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/lujoponezamula.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/161423b74968b1---80999607497.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210915135146.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/jobusowifozoraxureda.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/25600012180.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/mikiredozojoxifexus.pdfIn PDF document text
    • http://jpsacademy.com/slbdavbatala/userfiles/file/reluwetasinirokesigejali.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents/files/16277068163.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/27067919649.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/webavevakasizina.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_off0000bf94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF94 17244 bytes
SHA-256: e0cb2d7ab6c518cce0cec44563d81c2c69efcac683d259c1cf6a5a5fa18097a5
font_01_sfnt_off0000ec4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4E 10632 bytes
SHA-256: 7f778ff8c44000343ea8133463c20d76815ad02c293061ed9a5a15559ee0153f
font_02_sfnt_off0001048e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1