Malicious PDF — malware analysis report

Static analysis result for SHA-256 44df4041a876def0…

MALICIOUS

PDF

85.9 KB Created: 2021-02-20 07:38:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: a63df7a4fe31e7c2f668ca55b72eebe0 SHA-1: be64908c6212f529d26d71d302f166840815525c SHA-256: 44df4041a876def037c115bd7323351e6d85b345550e7cab137da032caefa562
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggests a phishing or SEO spam campaign. Although no scripts were explicitly extracted, the nature of the PDF and the detected heuristics point towards a malicious intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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=film+a+critical+introduction+pramaggiore+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370264/normal_6030713478e57.pdfIn PDF document text
    • https://zemabata.weebly.com/uploads/1/3/4/6/134677216/3445590.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368227/normal_6004a5fbb26b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392872/normal_602708c2c71fd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424637/normal_5fcb0fd0e8b61.pdfIn PDF document text
    • https://mukoxawav.weebly.com/uploads/1/3/4/6/134627731/zegakux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371261/normal_6030833f0e0b3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420459/normal_5fcafd873c6c8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373527/normal_5fdd7c606d0b1.pdfIn PDF document text
    • https://gozobamo.weebly.com/uploads/1/3/4/7/134714837/rawuf.pdfIn PDF document text
    • https://ligibokone.weebly.com/uploads/1/3/1/8/131858045/4021664.pdfIn PDF document text
    • https://bisuxijux.weebly.com/uploads/1/3/5/3/135323954/ramaxe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407810/normal_6007b15d37d30.pdfIn PDF document text
    • https://lemusudavigi.weebly.com/uploads/1/3/5/3/135395292/77d2e617f108fb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368742/normal_5fd31b36261aa.pdfIn PDF document text
    • https://romuxejis.weebly.com/uploads/1/3/4/8/134887308/sakoketuses.pdfIn PDF document text
    • https://pomulopegodetom.weebly.com/uploads/1/3/1/3/131384256/7197922.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
    • https://s3.amazonaws.com/tesotiwapax/sozuvuvetagutuloxi.pdfIn PDF document text
    • https://s3.amazonaws.com/fonibinaraj/94372704373.pdfIn PDF document text
    • https://s3.amazonaws.com/serogajugomiji/commando_2_filmywap_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/how_to_use_a_weber_smokey_mountain.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_off00010646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10646 5136 bytes
SHA-256: c65bf76123c8faccb9e56528eab568a5ecdbf16414496ba2fb7d9ab3d1738900
font_01_sfnt_off00011799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11799 10540 bytes
SHA-256: d18d33ae0b728e36ac90e78a88cb558aa8d33c08219b1117348162959f4a2641
font_02_sfnt_off00013b71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B71 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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