Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdb964ce01476778…

MALICIOUS

PDF

85.8 KB Created: 2021-03-25 15:23:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b77aa81ac312df70a0e1b866c857f2fa SHA-1: 16cb377d5b32148e353597ad0b9b38df6617821f SHA-256: bdb964ce0147677897242398587ed6962dec402694a8da8ccea9a07952e0db93
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, many of which point to potentially malicious domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://jumiwimov.ru/strik?utm_term=ratio+analysis+project+class+12th PDF link annotation
    • http://wojurimaxab.mywebcommunity.org/best_encyclopedia_book.pdfIn PDF document text
    • https://penuwoguf.weebly.com/uploads/1/3/6/0/136056634/moroxepivofewa_suduwa.pdfIn PDF document text
    • https://pejusokipa.weebly.com/uploads/1/3/4/9/134902294/japijem-sasuju-rusikajokapum.pdfIn PDF document text
    • https://lujogome.weebly.com/uploads/1/3/4/6/134617312/8342532.pdfIn PDF document text
    • https://dobamadolexazi.weebly.com/uploads/1/3/4/4/134478964/folufiruw_wolalitulu_sotuzifomexoma.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0039d8c2-38ec-45cb-a191-06a17e6915e2/novunosawepeku.pdfIn PDF document text
    • https://s3.amazonaws.com/xukirizugukugi/linking_verbs_worksheet_for_2nd_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/xapota/alchemist_book_in_urdu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0697c488-b04d-4f4a-8dee-83f92acd8f44/sisterhood_is_powerful_read_online.pdfIn PDF document text
    • https://d1159ab4-cbf5-42eb-897b-83a5e94cd7da.filesusr.com/ugd/536122_54c730cf6410434f8c659efa7b3bac79.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pajeriramal/59890768325.pdfIn PDF document text
    • https://s3.amazonaws.com/vojapu/is_the_herald_sun_printed_today.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/msi_h81m-p33_v2.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/behringer_xenyx_fx_list.pdfIn PDF document text
    • http://luvetux.myartsonline.com/jebupazi.pdfIn PDF document text
    • https://b724dda4-e2e0-47c5-811c-ae3b7273578b.filesusr.com/ugd/a1e5ee_10d24d4bfa0246cd9eac775de61bde9e.pdf?index=trueIn PDF document text
    • https://4e4608fd-868e-43f5-b6ba-14e5e4b50785.filesusr.com/ugd/b1f235_210cfd9171104b248389f0129c9abcc2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6c78e57-4aa1-4d82-970c-b97e2622e4a2/risd_school_schedule.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/giduwozoposetosasot.pdfIn PDF document text
    • https://4121a797-204a-431c-92a8-8e24072fb342.filesusr.com/ugd/b972d5_d22ea0fe97844b6499d697e3f96d0d06.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C6 5388 bytes
SHA-256: b394d01643a445073e51f16c6d0d613837bd3b496348d0a9c8068c353951baf6
font_01_sfnt_off00010c2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2F 11832 bytes
SHA-256: f7b7b8c0badfb962209a41e9a3c5b0f54adbd81e5477e64a30d080d2fb7b5219
font_02_sfnt_off000134b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B3 16164 bytes
SHA-256: e296a61d2d303e35be9e1a35631556663d2780498efa7e8f3867bf557f172fe6