Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e1b77eeb9cff51c…

MALICIOUS

PDF

82.8 KB Created: 2021-02-25 18:22:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 497b98c3458f5815333e8be49956d6b5 SHA-1: 7c82d159c67dc6fcc22c81744f8b42658c1a6712 SHA-256: 4e1b77eeb9cff51c5d222eda45368a3bc28e9b05ad45d6abcd9aada18db0fb36
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, such as 'https://baarspo.ru/strik?utm_term=how+to+determine+demand+factor', are likely used to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to exploit users through deceptive content and external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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+to+determine+demand+factor PDF link annotation
    • http://tifeguga.22web.org/99353160654.pdfIn PDF document text
    • http://bikejesoxatelo.mygamesonline.org/chocolate_black_and_tan_cream_red_miniature_dachshund_puppy_for_sale_nyc.pdfIn PDF document text
    • http://zumewidife.mygamesonline.org/54889074078.pdfIn PDF document text
    • http://lixodamevurobar.mygamesonline.org/roku_streaming_stick_plus_remote_wont_pair.pdfIn PDF document text
    • http://dodemul.mygamesonline.org/13484374918.pdfIn PDF document text
    • http://wejowadizabudex.mypressonline.com/how_do_i_log_into_my_cloud_key.pdfIn PDF document text
    • http://pumujavebedopa.iblogger.org/fuxofigon.pdfIn PDF document text
    • http://hookup668.site/what_is_the_role_of_judiciary_in_south_africahhcmk.pdfIn PDF document text
    • http://kitafoged.medianewsonline.com/what_does_the_lord_say_about_divorce.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/rikolesafuwofar/69648673182.pdfIn PDF document text
    • https://s3.amazonaws.com/tiniruru/51914553031.pdfIn PDF document text
    • http://wonanikapudidak.atwebpages.com/what_can_you_mix_with_air_in_little_alchemy.pdfIn PDF document text
    • http://wulibazosuxib.onlinewebshop.net/vupaped.pdfIn PDF document text
    • http://bumurulepowele.myartsonline.com/brooklyn_colm_toibin.pdfIn PDF document text
    • https://s3.amazonaws.com/serogajugomiji/baberojosubin.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_off000108bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BD 5008 bytes
SHA-256: 9fd9ed1c96358475d557ec6c5237be29d5c32593a81d34fa4615bcb358f54c98
font_01_sfnt_off000119bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BF 10848 bytes
SHA-256: b0aa7d660a7f6d34c8beddcbe5c3842db62b4252029355460aaa6220dfc6b60d

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