Malicious PDF — malware analysis report

Static analysis result for SHA-256 626275858ec0b983…

MALICIOUS

PDF

77.0 KB Created: 2021-03-04 07:00:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 07cf3d6015d00b97b545ccd2de39baa9 SHA-1: ba07ab2bb21c34854426ea37a50e7e9552e695af SHA-256: 626275858ec0b98376f2c1b89b952790725444bb5bd3242b58ec0cffa4acaa3f
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 flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to 'planet earth pole to pole video questions answers', likely to entice users to click on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/123?utm_term=planet+earth+pole+to+pole+video+questions+answers PDF link annotation
    • https://cdn.sqhk.co/butiluluvuk/gsgd6gh/learn_coding_html_css.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380084/normal_60117625672ef.pdfIn PDF document text
    • http://card2card-perevod24.site/86197783084dobm4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495686/normal_5ff4eab883fd5.pdfIn PDF document text
    • http://gooddevice-online.com/taxejisabinuzizumix6b.pdfIn PDF document text
    • http://sberhome.ru/vatipomojixopatiritozeloh7yip.pdfIn PDF document text
    • https://cdn.sqhk.co/vutowogipu/gciRgdw/66579148317.pdfIn PDF document text
    • http://thedefenseforge.com/atelier_ayesha_plus_trophy_guidee59gm.pdfIn PDF document text
    • https://cdn.sqhk.co/lojeliju/grpsejg/word_planet_means.pdfIn PDF document text
    • https://cdn.sqhk.co/jopuromug/suygd3N/tofatagefuv.pdfIn PDF document text
    • http://cleaner-inn.club/why_is_my_craftsman_riding_mower_not_startingnvaxj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482216/normal_5fdbc67f55981.pdfIn PDF document text
    • https://cdn.sqhk.co/vivepovugeli/5oRDOh8/xakojidasekej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sajoveguduv.onlinewebshop.net/79015638589.pdfIn PDF document text
    • http://kozogasivufi.myartsonline.com/platica_sobre_seguridad_en_el_trabajo.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A6 5328 bytes
SHA-256: e66a0422aa67e4094a13f3e98d29b4035f82ddce426d7e7def9962ecd1760bbe
font_01_sfnt_off0000e8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CF 11416 bytes
SHA-256: 5892350d4c2084e9b1e959a85d15ba2131d200e3845a14d91728c2a0d8f8294d
font_02_sfnt_off00010fe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE9 16092 bytes
SHA-256: 39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67

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