Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfc2ee0878ebab4b…

MALICIOUS

PDF

82.5 KB Created: 2021-09-10 23:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 5d062c70d7e8e4e85fb841bf3e05f2aa SHA-1: 0ea70bef925870701e50ca931e0c3c795e3a0077 SHA-256: cfc2ee0878ebab4be19271cbd87d9521906125d0311c82a593b4cc62b7e26369
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and a large number of external URLs, many of which are hosted on disposable domains and appear to be part of a link farm. This indicates the PDF is likely intended to redirect users to malicious sites, potentially for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=kresley+cole+knjige+pdf PDF link annotation
    • http://alemotta.com/resources/original/file/85576499753.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/febizupedevujibevarud.pdfIn PDF document text
    • http://wirtrauenuns.ch/images/file/rakotixugesijawaf.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/nonivofejetadevevifiseg.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/48073496689.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/27830209203.pdfIn PDF document text
    • https://phuquiland.com/upload/files/xiwaluxirozizojegutedep.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/1608135646.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/73806856306.pdfIn PDF document text
    • http://scpt.it/userfiles/files/takumitamiminudakimurud.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/34467554651.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/bejewagowogefun.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/bubag.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/32864120400.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/fusegovikopaxudaxevenesez.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/14137851924.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/94801451865.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/12319131704.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/23605846734.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/votivirufola.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/b409510df8c5e2bfbc71ca742c1d8d16/fasopiru.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/kodotuwomimevipaxizebomup.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_off0000d4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED06 10864 bytes
SHA-256: da1c345541767045bede15b0217f5a5a56c7211db7d9fd61016478b02b5ec565
font_02_sfnt_off000105ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FF 20372 bytes
SHA-256: 354e5328e400be97820363d52d617fc8f6b70d335528cc5e7815168095041c90

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