Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4b8a9c01426a512…

MALICIOUS

PDF

75.6 KB Created: 2020-12-29 18:11:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b0b422ba19efd49d653e4c301d211ed2 SHA-1: 797a06163e174d45a6591d5f39514142cde911fb SHA-256: d4b8a9c01426a512d4560dc60b4e5d368b791809cb4c1fb85571556793ac1df5
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to a suspicious domain that appears to be part of a link farm or SEO manipulation scheme. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the presence of embedded links and the overall structure suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/strik?utm_term=clay+island+survival+games+online PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4457590/normal_5fc94aaaa4c36.pdfIn PDF document text
    • https://cdn.sqhk.co/pupevadojas/bjfRgdb/muwewugasuxerava.pdfIn PDF document text
    • https://cdn.sqhk.co/guxuboru/O9egeCU/30051282862.pdfIn PDF document text
    • https://xisubuto.weebly.com/uploads/1/3/1/3/131380177/jevineg_pibuzedeb_javelopemomedo.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/murudute/sklz_hurricane_category_4_swing_trainer.pdfIn PDF document text
    • https://s3.amazonaws.com/wikurixobelu/age_of_wonders_3_steam_guides.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/roid_gut_bodybuilders.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3eea52f8-6076-4d84-94f8-558d912fc083/fufebu.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/east_haven_public_school_calendar.pdfIn PDF document text
    • https://s3.amazonaws.com/fexuror/83450440516.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/the_great_gatsby_vocabulary_quiz.pdfIn PDF document text
    • https://s3.amazonaws.com/satuja/60483775135.pdfIn PDF document text
    • https://s3.amazonaws.com/povelenavuviw/mesejunebokegunapuvewi.pdfIn PDF document text
    • https://s3.amazonaws.com/bivanud/how_to_merge_docs_on_mac.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEE 5132 bytes
SHA-256: 1b3e889ba106c5bc990268bf06bfaffffe0a2df61fc32f05a04dd03a774006db
font_01_sfnt_off0000ef49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF49 10632 bytes
SHA-256: 987fb20e7472062c41210b532534ed4f84a9836259f938708aef642724cc7ecf
font_02_sfnt_off00011379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11379 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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