Malicious PDF — malware analysis report

Static analysis result for SHA-256 67084a641d71b15d…

MALICIOUS

PDF

83.5 KB Created: 2021-03-03 22:08:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: ac05e7a5c814a426340ba5ae33163cf3 SHA-1: 510ed3f36286a96cb0bd8607214240ee64822940 SHA-256: 67084a641d71b15dafec593b0f536458eadd2f548add290d80083f2265e29412
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, as indicated by the PDF_SEO_LINK_FARM heuristic. One of these links, https://jottigo.ru/strik?utm_term=the+secret+life+of+pets+2+cast+with+pictures, is flagged as unknown reputation. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to facilitate malicious actions via its embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/strik?utm_term=the+secret+life+of+pets+2+cast+with+pictures PDF link annotation
    • https://nenafefetu.weebly.com/uploads/1/3/1/4/131406263/a09ae.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefima/e6ifjc8/interview_questions_to_ask_a_preschool_teacher_assistant.pdfIn PDF document text
    • https://vojimefijizudi.weebly.com/uploads/1/3/4/3/134310580/3673420.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484114/normal_603a81a0921ec.pdfIn PDF document text
    • https://kilewesiviteki.weebly.com/uploads/1/3/1/1/131163613/b0caa9.pdfIn PDF document text
    • https://limorevoxa.weebly.com/uploads/1/3/4/6/134611026/godorubo_zegufaka.pdfIn PDF document text
    • https://biposekiz.weebly.com/uploads/1/3/5/3/135349949/pesaraxa_bebazezedod_lobaxavubobor_luvezu.pdfIn PDF document text
    • https://lejuziluzamof.weebly.com/uploads/1/3/4/8/134863123/eb403036c23e811.pdfIn PDF document text
    • https://cdn.sqhk.co/lagusive/dyy2jj0/dopesopeg.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/pezofut/embroidery_designs_jef.pdfIn PDF document text
    • https://s3.amazonaws.com/mejobu/slackware_iso_32_bit.pdfIn PDF document text
    • http://kowefejarozop.epizy.com/adding_mixed_numbers_free_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/97670102337.pdfIn PDF document text
    • http://lovunoleseb.epizy.com/zudikafubagosininexox.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/video_editing_free_software_android.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_off0000fb9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9D 5052 bytes
SHA-256: bc0bf24b7f68626096f184e24fd54beb169aedbfc23b636091e503a6fabf0082
font_01_sfnt_off00010cf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF5 10984 bytes
SHA-256: f108196a475ef99d951c3fcf120f9c245a099d4873561bf33628beadef9c12fa
font_02_sfnt_off00013279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13279 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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