Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1c7c9250520758d…

MALICIOUS

PDF

72.6 KB Created: 2021-03-01 03:10:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d72fcc84a4ed0baf93c628d48169b051 SHA-1: d7d7c8a4caed8ee7cf236bbc4ac4c0907ae2b763 SHA-256: b1c7c9250520758d921e77be5bd0ac44cbd2aadd4e3c751c6a76c59805793c7c
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which appear to be part of a link farm designed for SEO manipulation. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs further supports a malicious intent. While no scripts were directly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful content or facilitate further exploitation.

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://zajinet.ru/award?keyword=is+elena+in+love+with+damon PDF link annotation
    • http://gtmedis.com/how_to_get_to_mount_fuji_from_kawaguchiko_statione6l6i.pdfIn PDF document text
    • https://xuxukogizi.weebly.com/uploads/1/3/5/3/135320654/gelarunepebut.pdfIn PDF document text
    • http://questotzvezd.space/zaguwomo4kcax.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393628/normal_5fc9dc4a15773.pdfIn PDF document text
    • https://cdn.sqhk.co/bodovukig/NIhjCQ9/descargar_liker_app_blue.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fejozimi.epizy.com/asvab_prep_book.pdfIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/fancy_pants_adventure_premium_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/foot_deformities_in_rheumatoid_arthritis.pdfIn PDF document text
    • https://s3.amazonaws.com/xesigeze/reported_cases_of_zika_in_costa_rica.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/how_to_sew_a_face_mask_with_filter_pocket_pattern.pdfIn PDF document text
    • http://zepedijuva.epizy.com/interrogative_pronoun_worksheet_for_class_5.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/jexiditefifolimuzalu.pdfIn PDF document text
    • http://zewipidurat.epizy.com/gatinedilel.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_off0000e196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE196 5060 bytes
SHA-256: ed692fba24cd0aa2bab9a3f1e36053c8ccdd86d0649bd94f71e8e52c68d4f5a6
font_01_sfnt_off0000f2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B6 10304 bytes
SHA-256: b756fef89a35e53472c0002f3071126d0eff30036f9a0036240802f1eca44e22

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