Malicious PDF — malware analysis report

Static analysis result for SHA-256 8edbaa38aa02893e…

MALICIOUS

PDF

93.5 KB Created: 2021-02-26 10:21:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 0289fe3e83a6252022fe61dd5af1a694 SHA-1: 764858bb718ed086b35fdb278ca43023e2b67dd2 SHA-256: 8edbaa38aa02893e1577bd961cb3fca70fe086e91a66bbaaa84f34247f3e0664
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many pointing to disposable hosting, and is flagged by heuristics as a link farm. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The embedded content, though heavily obfuscated, suggests a lure related to a 'Dyson big ball animal allergy manual', likely to drive traffic to SEO spam or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://leonvi.ru/wix?keyword=dyson+big+ball+animal+allergy+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4462073/normal_603619520e261.pdfIn PDF document text
    • https://cdn.sqhk.co/vanewano/Bhgijew/fuvosu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418963/normal_5fc8e8df22765.pdfIn PDF document text
    • https://cdn.sqhk.co/kunimanujage/boR30yR/john_gba_lite_download_ios.pdfIn PDF document text
    • http://lobabinuladeri.medianewsonline.com/1914384626.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370778/normal_602999cdb0dcb.pdfIn PDF document text
    • https://cdn.sqhk.co/pefisemise/oGjaifk/90246421722.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxudofexal/Vifogfe/legudaxarapolumol.pdfIn PDF document text
    • https://bewimesev.weebly.com/uploads/1/3/4/7/134753962/jikovagano.pdfIn PDF document text
    • https://cdn.sqhk.co/tilomulobet/IgdMrif/84534985516.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412900/normal_5fd257ea0c561.pdfIn PDF document text
    • https://lobogisotu.weebly.com/uploads/1/3/4/8/134870795/ruporunekidilu_xekavere_fezudapabu.pdfIn PDF document text
    • http://rozujed.sportsontheweb.net/13713361293.pdfIn PDF document text
    • https://jeduwisuduxib.weebly.com/uploads/1/3/1/4/131483356/bbc056bc33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409610/normal_600f094a08c9c.pdfIn PDF document text
    • https://bifawodeg.weebly.com/uploads/1/3/5/3/135348479/4146042.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/baxegezivumi/hsa_accident_report_form_ir1.pdfIn PDF document text
    • https://s3.amazonaws.com/nabifovu/colors_of_the_rainbow_worksheet.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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06A 2856 bytes
SHA-256: ede077bcf9d936b2deabd1ca36e5cf164b77d75f1467ec74ab7a8d43bb048d6a
font_01_sfnt_off0000fa95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA95 5048 bytes
SHA-256: e085226624544f1e0d5cee420c7af3282bf356b352c2ae413690e0033ead1283
font_02_sfnt_off00010ba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA6 2172 bytes
SHA-256: 36b13b2795f90cbf4011af1e61bb2a4fb35694c14b6e1b74f867255c6693e918
font_03_sfnt_off00011505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11505 14796 bytes
SHA-256: 6b0752eabfcd9bcad8052c1a2b574f9e5228ed62c16c0ee12c24f4112736f17f
font_04_sfnt_off0001437a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1437A 16240 bytes
SHA-256: 0674acd334b5d9d24fca46324cf24cdceda2da50095ae44f67deaeca14b27464
font_05_sfnt_off000158d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158D1 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3