Malicious PDF — malware analysis report

Static analysis result for SHA-256 f71cb1b07fb3472e…

MALICIOUS

PDF

85.4 KB Created: 2021-02-28 12:26:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9857885c0cca2446a33994b82cab8147 SHA-1: a6d402da23e713af85863ac310f58e4634092ab4 SHA-256: f71cb1b07fb3472ee113b66af6b23d585fd52c6108acb2952b7323fca4faa758
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URL pointing to 'baarspo.ru', which is likely used for phishing or to serve a secondary payload. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is part of a network of sites designed to attract traffic, further supporting a malicious purpose.

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=nikon+coolpix+s9700 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4420238/normal_5ffb440ce83d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463808/normal_6023734b386ee.pdfIn PDF document text
    • http://gejokakop.mygamesonline.org/what_is_the_meaning_of_chokey.pdfIn PDF document text
    • http://zipubezexupoka.mywebcommunity.org/femoxikafukeme.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490524/normal_600dfc6f0117a.pdfIn PDF document text
    • http://kesuvajeb.scienceontheweb.net/5528388571.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366661/normal_5fd9ff497b952.pdfIn PDF document text
    • http://opensol.xyz/cisco_sg200-50_console_portkn0k5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393763/normal_5fe0702722ec1.pdfIn PDF document text
    • http://prazdnikprosto.ru/zilorifepadopekefuxepajixd667e.pdfIn PDF document text
    • http://coins24h.com/fujoxideweziburosedexerxb4ak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zutugidod.onlinewebshop.net/what_is_electromagnetic_wave_formula.pdfIn PDF document text
    • https://s3.amazonaws.com/ximupuv/27325775115.pdfIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/jafekatamuserotet.pdfIn PDF document text
    • http://lepoxas.rf.gd/19647334829.pdfIn PDF document text
    • http://gufutom.rf.gd/petsafe_wireless_fence_collar_not_charging.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/bangla_calendar_apps_2019.pdfIn PDF document text
    • http://vufufule.epizy.com/34671674703.pdfIn PDF document text
    • https://s3.amazonaws.com/kewuxejikiwe/tomisojivujadinijiraka.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_off00010fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD4 5100 bytes
SHA-256: 730beff73f1ca232c3ea30524a87001d66f169e73397bc5b5694bc553e49c8fb
font_01_sfnt_off0001215c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1215C 11128 bytes
SHA-256: 3d67d914074ed8366ac78c7f4afa099d3ff48a4bd293a5fd75e0edbc361c76c4

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