Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6a5f3d3d15e8d06…

MALICIOUS

PDF

72.7 KB Created: 2021-02-16 23:24:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 417389977ba3e689bcc84c6ceb3e9f96 SHA-1: c8d0b90afcd0a1871b9d4ebbdb3c43fb4c6735ac SHA-256: b6a5f3d3d15e8d06e77225edba040b88440efea6ab622af144b435d2f5fa9a41
136 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 identified as a phishing trojan. It contains an embedded URL that redirects to a suspicious domain, likely intended to deceive users into downloading further malicious content or revealing sensitive information. The document body, though heavily obfuscated, appears to be a lure related to academic writing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://maypoin.ru/strik?utm_term=how+to+write+the+significance+of+a+research+paper PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4448116/normal_5fe3cb1167638.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405687/normal_5fe8233837309.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402507/normal_6005ae8636921.pdfIn PDF document text
    • https://cdn.sqhk.co/jekunesoru/I2jfShb/44911971809.pdfIn PDF document text
    • https://cdn.sqhk.co/siwemawatu/yxhdt2A/ninudonuletezosubezuvugeb.pdfIn PDF document text
    • http://fasad-dom.site/zodovuvitesazodetvlpcg.pdfIn PDF document text
    • https://cdn.sqhk.co/dagufiwus/dPsRcie/1179319143.pdfIn PDF document text
    • http://voiprormul.xyz/jijufilusispq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447878/normal_5fcbe7429c044.pdfIn PDF document text
    • https://cdn.sqhk.co/mojupesonon/bujbnib/medicare_easy_pay_form_5510.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500887/normal_6012a2a2d36fa.pdfIn PDF document text
    • http://gamedv.design/vuwuzisepawiribikarabamw474v.pdfIn PDF document text
    • https://cdn.sqhk.co/vizakifito/hhvjfha/vapawaxafufiridetujezunux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405902/normal_5fe880e1345be.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/dusined/girofewa.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/2._dereceden_denklemler_aritmetik_ortalama_forml.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/awadhesh_premi_new_song_2018_bewafai.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_off0000e1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B2 5296 bytes
SHA-256: ee84d1b16ec66c7e2338b7b55df547dba077f0f0aeef175bd10f9f56af524837
font_01_sfnt_off0000f3cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CF 9888 bytes
SHA-256: 42b7e8434ad30478670fefd0031f96417a6bd9e6ddad106c6244ff4c2a814184

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