Malicious PDF — malware analysis report

Static analysis result for SHA-256 e373f3e38f4f8eb7…

MALICIOUS

PDF

83.0 KB Created: 2021-03-17 08:02:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 65afe0d0eb1bc077221f5e928a00eee7 SHA-1: f71e374d9bebeacaf08e1ada0e818884881dc000 SHA-256: e373f3e38f4f8eb778b827d1fc5d07dad6d1d70a08822b5f2d9a8b0d3857fd39
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

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 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.
  • 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://yafferge.ru/award?keyword=sieve+analysis+test+for+aggregate+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4416143/normal_5ff155e8960a2.pdfIn PDF document text
    • https://vukosigubew.weebly.com/uploads/1/3/4/8/134860762/7524995.pdfIn PDF document text
    • https://loguxofe.weebly.com/uploads/1/3/0/7/130775118/berigobefi-vipemesivutuzen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401505/normal_5fd8b81bc187d.pdfIn PDF document text
    • https://tepupareta.weebly.com/uploads/1/3/0/8/130814680/426c1ad22af518.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459631/normal_60309f9ee9702.pdfIn PDF document text
    • https://tosoremekik.weebly.com/uploads/1/3/4/7/134771766/81293d.pdfIn PDF document text
    • https://jujizifij.weebly.com/uploads/1/3/4/3/134309807/xijavogodamo.pdfIn PDF document text
    • https://bajigexok.weebly.com/uploads/1/3/4/1/134131467/genojavorujujixidise.pdfIn PDF document text
    • https://midodelawipage.weebly.com/uploads/1/3/4/5/134585137/6488606.pdfIn PDF document text
    • https://lebamemodeli.weebly.com/uploads/1/3/0/7/130776101/805ff8cfc.pdfIn PDF document text
    • https://tesujirigagorin.weebly.com/uploads/1/3/4/8/134869290/2006658.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407303/normal_6046ea30b27ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402707/normal_5ff7bc0a3b54d.pdfIn PDF document text
    • https://jevokave.weebly.com/uploads/1/3/4/2/134266272/9988df.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/wutezigojuxi/copycats_crossword_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/place_value_definition_for_second_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/nowonovege/dubixuvurabine.pdfIn PDF document text
    • https://s3.amazonaws.com/fomudebipefasu/python_language_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/rodubuxug.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_off00010739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10739 5476 bytes
SHA-256: 60a8ca81e04f84f8b85c15c1828b145aca1816e5a6d06cd606579d9fe7623633
font_01_sfnt_off000119f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F5 10844 bytes
SHA-256: eeb16aac6cac8616b4cdc4362579399e2e482237814a87b70744e1f9c0730812

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