Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fb87ae9a01af44f…

MALICIOUS

PDF

47.4 KB Created: 2020-11-07 00:50:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ba06eae7c3125336096e1b5f9b9bdcf9 SHA-1: 21d1084fabd197edbbdbba0ddc0eb3e4cc39dd4f SHA-256: 7fb87ae9a01af44f4008675b4c6b1089ab31583aa9d1d97394a03db71f502cac
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://traffine.ru/aws?keyword=big+hero+6+honey+lemon+purse PDF link annotation
    • https://gurigibafex.weebly.com/uploads/1/3/0/7/130739571/xovefirebe-dikuxepixazo-lovojulobena-perugusopi.pdfIn PDF document text
    • https://mitegasur.weebly.com/uploads/1/3/1/8/131871816/6150352.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://tafexoru.files.wordpress.com/2020/11/3294531957.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/consent_of_surety_to_final_payment.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/teroruraramixazubikuwila.pdfIn PDF document text
    • https://wisofira.files.wordpress.com/2020/11/jakoviwalefusaxesape.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/music_definition_of_syllabic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dc5c990-fd65-4261-a4c1-949c782724f9/miles_summer-_pullen.pdfIn PDF document text
    • https://direnokaf.files.wordpress.com/2020/11/70020016825.pdfIn PDF document text
    • https://sisivepigol.files.wordpress.com/2020/11/lemezatirero.pdfIn PDF document text
    • https://s3.amazonaws.com/ribowexulo/voucher_entry_in_tally_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/sword_art_online_progressive_6.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007bf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BF8 5328 bytes
SHA-256: a8a0d78e54277ba137a5b9d12adb7ae2abfecb3afa5107cb19e6d58bb9dbf60f
font_01_sfnt_off00008dfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DFE 10324 bytes
SHA-256: e02ebdc97c53f7814b9129ba3a785de38c079be6314292f2cc316b93b033fa30