Malicious PDF — malware analysis report

Static analysis result for SHA-256 19102157cdd1c549…

MALICIOUS

PDF

74.2 KB Created: 2021-02-07 23:25:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: b83b428e5751d2434a6edaf65abb02f5 SHA-1: 1957f966a30b087e1ebb581e3b01b447d80642ee SHA-256: 19102157cdd1c54967160a6db413db8343d36cb08312598929c613f839ac86dd
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, with one prominent URL leading to 'baarspo.ru'. This suggests an attempt to drive traffic to potentially malicious content or phishing sites. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution lure.

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
  • 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://baarspo.ru/123?utm_term=video+devil+apk+latest+version PDF link annotation
    • https://vetenejoxo.weebly.com/uploads/1/3/1/3/131379321/8926741.pdfIn PDF document text
    • https://goguribepolim.weebly.com/uploads/1/3/0/7/130739596/9507447.pdfIn PDF document text
    • https://wisamifogafize.weebly.com/uploads/1/3/4/5/134598642/ligen-kekunafovilu-tunijev.pdfIn PDF document text
    • https://nazisedisan.weebly.com/uploads/1/3/1/8/131871674/fibaj.pdfIn PDF document text
    • https://rowopubogapog.weebly.com/uploads/1/3/4/2/134234702/kopaluburi.pdfIn PDF document text
    • https://cdn.sqhk.co/fekolisuzub/iifHJhj/28496035499.pdfIn PDF document text
    • http://xasefosixojoloj.iblogger.org/uterine_av_malformation_pregnancy.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/netinuwa/upsc_sample_answer_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/15146883840.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/tisogubim.pdfIn PDF document text
    • https://s3.amazonaws.com/daniwodug/62267914732.pdfIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/30572999117.pdfIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/zosawejovajur.pdfIn PDF document text
    • https://s3.amazonaws.com/xutomoxu/guided_tours_new_zealand.pdfIn PDF document text
    • https://s3.amazonaws.com/fedojigudaj/shortcut_to_format_sql_query_in_ssms.pdfIn PDF document text
    • https://s3.amazonaws.com/tumuzu/54003976548.pdfIn PDF document text
    • http://lubunazunenixo.rf.gd/authorized_representative_designation_form_aetna.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_off0000d939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD939 4832 bytes
SHA-256: bab571e2132ef91560745a2c8cc5846b1b9854e7b396daa9d457f9c3c7fa3ba6
font_01_sfnt_off0000e9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AF 10672 bytes
SHA-256: fdd2f98fb9fe66ca2b14ea53fde9c29ec9ca328d9cbbf95e8a04c0082197af8a
font_02_sfnt_off00010ded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DED 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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