Malicious PDF — malware analysis report

Static analysis result for SHA-256 b26ddda0ee79b69e…

MALICIOUS

PDF

71.0 KB Created: 2021-02-13 17:36:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 3bb967527e46afad8805e343b9e655c5 SHA-1: a8d0f09fc222e86eaa63d50a056c0bc0f4512bc0 SHA-256: b26ddda0ee79b69e0496a48d8afad0644ae5f812f7068a1c8331857ed68a11c2
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to 'texes math 4 8 test guide free'. The presence of external URIs and the link farm heuristic indicate an attempt to redirect the user to potentially malicious content.

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://druttle.ru/wix?keyword=texes+math+4+8+test+guide+free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4480876/normal_5fdea61e1d751.pdfIn PDF document text
    • https://saletenabij.weebly.com/uploads/1/3/4/3/134339554/nowofojisinit.pdfIn PDF document text
    • http://buytoday.cc/62907602735n33ho.pdfIn PDF document text
    • https://tokafiwunan.weebly.com/uploads/1/3/4/3/134372509/kixiw.pdfIn PDF document text
    • https://korenumotijele.weebly.com/uploads/1/3/4/6/134687452/pajopamivu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417535/normal_6011a605abbd9.pdfIn PDF document text
    • https://ruwizugaxuluba.weebly.com/uploads/1/3/4/7/134759804/4495c25ba2a584.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460694/normal_5fd30c6924718.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389804/normal_5ff712d08f32d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475389/normal_5fc682b248886.pdfIn PDF document text
    • https://jefaganogebe.weebly.com/uploads/1/3/1/4/131437435/vajon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475391/normal_5fdae14eaa8c0.pdfIn PDF document text
    • http://womarerawona.iblogger.org/set_hamburger_icon_android.pdfIn PDF document text
    • http://bepibolet.22web.org/76390642118.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://marobow.epizy.com/bakapevevirogaxaw.pdfIn PDF document text
    • http://kobizesamow.rf.gd/rofoxatodobudavunekavi.pdfIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/7068683939.pdfIn PDF document text
    • https://s3.amazonaws.com/jivamubug/86550024388.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/91927094552.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_off0000d7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CB 5588 bytes
SHA-256: 0970a7ada26e7a147131f390cec637e4ca8bf57fe4d1e346f3415b4b14884e8e
font_01_sfnt_off0000eaaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAF 10532 bytes
SHA-256: 0527a5393aed959684c21b037020f820e179561d284403039a0377cae2703096

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