Malicious PDF — malware analysis report

Static analysis result for SHA-256 936e9f2f2e7e4b4f…

MALICIOUS

PDF

78.6 KB Created: 2021-02-19 17:51:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: a0aefba4649ce9cee9d0f0e54e37a99f SHA-1: 2e9a537af79ccf9e504631887e8f4d3a667269ab SHA-256: 936e9f2f2e7e4b4fb19bf2b9143ab695c8847786cd9bc6a7de308071e564c541
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by both ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. One embedded URL, 'https://jottigo.ru/wix?keyword=o8s+text+guide', is particularly suspicious and likely serves as a lure to a malicious site. No scripts were extracted, but the PDF structure and numerous external links point towards a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://jottigo.ru/wix?keyword=o8s+text+guide PDF link annotation
    • http://businesshelpservice.com/xopimo8h745.pdfIn PDF document text
    • https://lewagezu.weebly.com/uploads/1/3/4/3/134369469/81df7ba0.pdfIn PDF document text
    • https://ninusava.weebly.com/uploads/1/3/1/4/131436980/tumenizoputi.pdfIn PDF document text
    • https://dapadode.weebly.com/uploads/1/3/4/6/134646205/2c2f0bd22.pdfIn PDF document text
    • http://bettyloustintruckbbq.com/realidades_2_capitulo_6a-_4_answers5wgnv.pdfIn PDF document text
    • https://sazekunoteti.weebly.com/uploads/1/3/2/7/132740187/8047528.pdfIn PDF document text
    • https://nodokesomizi.weebly.com/uploads/1/3/4/6/134656280/1111d4c921b8fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479673/normal_602a52fd76bae.pdfIn PDF document text
    • http://atomyimperial.ru/68433974863naaps.pdfIn PDF document text
    • http://antonio-ita.space/stihl_fse_52_electric_grass_trimmer_reviewpfuw8.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/wutezigojuxi/direct_indirect_french_rules.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/36125263888.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/kiraladodokikekun.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_off0000ef41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF41 4944 bytes
SHA-256: 633e283bc571a070246ef851a9e7b3a4f64321b064b092f477074d738540db22
font_01_sfnt_off0001002d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002D 14780 bytes
SHA-256: 7b401b9c81e6c9f12ff087ecc413f21c3667458894ea5d3c815cfd6561c432cc

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