Malicious PDF — malware analysis report

Static analysis result for SHA-256 93d4d341b7d0c489…

MALICIOUS

PDF

75.3 KB Created: 2021-02-16 13:55:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 2744af938fdbbab239bb4dc6c3258abe SHA-1: 408296234b438ae4eaadcffe3a1fec8db76c0920 SHA-256: 93d4d341b7d0c48921342ead4f0dd5c8e93deee75768174367fadfe8bbe3116e
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a PDF link farm with numerous external URLs, including one pointing to a PDF file, suggests a tactic to distribute further malicious content or engage in SEO manipulation for phishing. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bologen.ru/123?utm_term=oxygen+49+3rd+gen+software PDF link annotation
    • http://umniashka.ru/11964405491n7fb9.pdfIn PDF document text
    • https://komutezux.weebly.com/uploads/1/3/1/3/131398036/didesaperaga-tigibozopapo-gijikufup-kulelizored.pdfIn PDF document text
    • https://tilawifi.weebly.com/uploads/1/3/4/4/134480999/08f1dda23d0fbf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367279/normal_5fe57f254722b.pdfIn PDF document text
    • https://xabogiseduwa.weebly.com/uploads/1/3/4/7/134717421/miwuxalepegixu.pdfIn PDF document text
    • https://kaguleturega.weebly.com/uploads/1/3/4/9/134904612/rarisuwasisenut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411937/normal_601fcff4011ba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367290/normal_5fc81acb1c24a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4531523/normal_5feda0845b518.pdfIn PDF document text
    • https://cdn.sqhk.co/wevavagu/ib6nhiz/71869505713.pdfIn PDF document text
    • https://paxolobiwoke.weebly.com/uploads/1/3/1/1/131163878/rejuzobag-setakegivi-wusoxaz.pdfIn PDF document text
    • https://fefujosiniw.weebly.com/uploads/1/3/4/8/134862858/2158291.pdfIn PDF document text
    • http://ses-sanobrabotka.ru/zelda_botw_art_bookvnbro.pdfIn PDF document text
    • http://fixmarker.fun/spanish_pronunciation_practice_worksheetl10ut.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408596/normal_5feccd6aca3c0.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/tawovojo/tozupodigafinawaradomupal.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/dozebunoxadotapudijamulot.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_off0000e630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE630 5740 bytes
SHA-256: 09fd040ad9bcd97679d6057ddc19a7ce4bc7bbdac1d5e61807f71b2fb13ec963
font_01_sfnt_off0000f9ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9ED 10696 bytes
SHA-256: c467461dbe8de93c0272d59f56755934eab7a3788a2c0b55244f706bae83e73d

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