Malicious PDF — malware analysis report

Static analysis result for SHA-256 e70adec4cef3e802…

MALICIOUS

PDF

67.2 KB Created: 2021-02-14 05:08:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: f292b464c4f09c67ffccb42fe0a2b418 SHA-1: c3b069a2f763a9836d26ffa7949d6fdbad396b00 SHA-256: e70adec4cef3e802e1d84bb65bb0b2c9884e7ef968f095053cdcf0359a859aef
184 Risk Score

Malware Insights

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

The PDF contains embedded links that point to external websites, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to a 'Microsoft report viewer 2013 redistributable package'. The presence of multiple disposable domains and link farms further supports a phishing or malicious redirection attempt.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wb?keyword=microsoft%20report%20viewer%202013%20redistributable%20package In PDF document text
    • https://static.s123-cdn-static.com/uploads/4376850/normal_5fe290f4018db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413373/normal_5fe7ea1689869.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488815/normal_5fc73141310fd.pdfIn PDF document text
    • http://vzale.ru/rokefuwujukigedosuflcqx2.pdfIn PDF document text
    • https://cdn.sqhk.co/miloxuso/i5jbtic/godebax.pdfIn PDF document text
    • http://rubyshup.space/bossa_nova_elevator_music75mx7.pdfIn PDF document text
    • http://yewes.space/galorice05v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413845/normal_6022bd7735855.pdfIn PDF document text
    • https://cdn.sqhk.co/tinodifozeza/d8phgCk/gabozojepegobibome.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388163/normal_6011d676226fa.pdfIn PDF document text
    • http://onlinesos.tech/74751002120uodmg.pdfIn PDF document text
    • http://bcpreactiva-enlinea.com/clairance_de_la_creatininesr886.pdfIn PDF document text
    • https://cdn.sqhk.co/fuxuduxexi/ygic2jf/netflix_movies_for_kids.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://lamerowed.rf.gd/casio_baby_g_manual.pdfIn PDF document text
    • http://rizukapusapanom.rf.gd/diverugexezivomovo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA10 5948 bytes
SHA-256: 7cfaa446417c9763380df9611e07aabd1f86ceaba24b969bfb07cf267a120285
font_01_sfnt_off0000ce81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE81 10180 bytes
SHA-256: 7c491ba33480253d61cc553cfd4662cabab0a22a90d848aa934db464a5bd0153
font_02_sfnt_off0000f167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF167 4324 bytes
SHA-256: ad623bc7c681097dfa1224999cf6cc6072d3ca9a137655dc1129b0261f0b357c

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