Malicious PDF — malware analysis report

Static analysis result for SHA-256 49cd22f0c9ea9e70…

MALICIOUS

PDF

93.3 KB Created: 2021-05-21 11:07:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: fdb81cce25ffd987de5ca6f4fe6c4ff4 SHA-1: 7bc841749aca82a90fa856903eba2005379f2aab SHA-256: 49cd22f0c9ea9e70fe7fd3faa5d007df611e3c8599980c3049ddc455778c567e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files, indicative of a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/strik?utm_term=how+to+remember+cations+vs+anions PDF link annotation
    • https://gojamomer.weebly.com/uploads/1/3/2/8/132815882/6531c309.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447460/normal_5fe43eacd1510.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421630/normal_5ffda7f3c264b.pdfIn PDF document text
    • https://zewonawexekuke.weebly.com/uploads/1/3/4/3/134318694/648ef4729.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413231/normal_5fd09c2d716a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407780/normal_6068a652373f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418583/normal_605b543f65e89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469351/normal_6068ef8c5f7a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427809/normal_60289f2ee4e34.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/gagagakigibapo/english_conversation_questions_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/40046445903.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/15659410231.pdfIn PDF document text
    • https://s3.amazonaws.com/lemefofutomapox/36260222848.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/rslogix_5000_structured_text_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/debamijizozexo/autocad_3d_rotate_ucs.pdfIn PDF document text
    • https://s3.amazonaws.com/tunenijexe/20363133701.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/korupunuvafalunib.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/adore_u_seventeen_ilkpop.pdfIn PDF document text
    • https://s3.amazonaws.com/kozibowisenatu/cisco_ccna_exam_price_south_africa.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000117c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C2 5168 bytes
SHA-256: e2f5647494e5e6761554e625a02ec89f4b3315576367f41016945412d4e14496
font_01_sfnt_off0001294b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1294B 12084 bytes
SHA-256: bb86e82dafd5c76116bdb31561a8c174dcd8e31776fe9bdf2bdb0e1d505d1c36
font_02_sfnt_off0001528a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1528A 16192 bytes
SHA-256: e6dc48a5f8044fc88983f84c48037799049443274552f3ae89ace31f59b81f13

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