Malicious PDF — malware analysis report

Static analysis result for SHA-256 aad2e3a5ae6f4180…

MALICIOUS

PDF

76.6 KB Created: 2021-02-17 15:41:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 294f5726c4c5a7cfbce8c8b8028f1a0c SHA-1: 3a3c2a67c91b7e948a4f8e571acadd70882d1b02 SHA-256: aad2e3a5ae6f418083442f374d95c20f24cae2967032bb4522db853e4752273b
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 point to domains that appear to be part of a link farm designed to artificially boost search engine rankings. One of the primary external links, 'https://baarspo.ru/strik?utm_term=how+much+does+a+petrol+lawn+mower+service+cost', suggests a lure to a website that may host malicious content or phishing forms. While no scripts were directly extracted, the PDF structure and the heuristic firings strongly indicate an attempt to redirect users to potentially harmful external resources.

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://baarspo.ru/strik?utm_term=how+much+does+a+petrol+lawn+mower+service+cost PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465559/normal_60207a1ac45ad.pdfIn PDF document text
    • https://fosevikotik.weebly.com/uploads/1/3/1/6/131637163/kovike_jajovex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481271/normal_6010964345ba0.pdfIn PDF document text
    • https://japipimimobuxi.weebly.com/uploads/1/3/1/0/131071183/finezululebexut_wurowuze.pdfIn PDF document text
    • https://wururozudarorar.weebly.com/uploads/1/3/1/3/131380521/sosokujaguwevagub.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445866/normal_5fcce4a873ae9.pdfIn PDF document text
    • https://pomisefinare.weebly.com/uploads/1/3/4/9/134902228/gorotijoruk_foriw_fafutaremu_wejetaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471236/normal_60248af76d69f.pdfIn PDF document text
    • https://jizetexosobuwek.weebly.com/uploads/1/3/0/7/130740437/levewuvakiguwe.pdfIn PDF document text
    • https://zoliparudoluja.weebly.com/uploads/1/3/4/6/134662317/wawubaroku-nimomamev-xejuvufan-lisidapajaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/timituvupame/yafo_kitchen_nutrition_information.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/ilearning_oracle_answers_section_4.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/xisugaf.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/wifi_driver_software_for_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/polymeric_micelles.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_off0000ee53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE53 5424 bytes
SHA-256: e89395485d98cf0d4b567257fe51664a8781d0358ad56a76a4bf53305cab822a
font_01_sfnt_off000100ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AE 10724 bytes
SHA-256: f5726b42725e35bdaaae3906b10bf96ae412e463697245e48cf44d3917ac670c

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