Malicious PDF — malware analysis report

Static analysis result for SHA-256 2763899cec72559d…

MALICIOUS

PDF

76.6 KB Created: 2021-01-28 11:39:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 51bcf25f34f87e36ed16e79ed0c5d919 SHA-1: f72bab04d2aa7149c96b5ceefbec5c29b7ddb1e1 SHA-256: 2763899cec72559dc5f0ad60ff45d6daccf3f1a3d1a65619ef6555e82cc98bd2
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a link farm, indicating a high volume of external links, with one prominent URL being 'https://bologen.ru/aws?utm_term=click+on+detroit+weather+report'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links point towards a malicious document designed 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://bologen.ru/aws?utm_term=click+on+detroit+weather+report PDF link annotation
    • https://zubosevofugojat.weebly.com/uploads/1/3/4/3/134307347/zeluj_pezake_gapol_nedesika.pdfIn PDF document text
    • https://mejodedasebedo.weebly.com/uploads/1/3/4/7/134725949/jajizeludariko_giwimuvog_kikejunok.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386829/normal_5ff484de5b1aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422631/normal_600d95cec53a0.pdfIn PDF document text
    • https://bafewalu.weebly.com/uploads/1/3/5/3/135350628/tegelusafakezinu.pdfIn PDF document text
    • http://qqkaxes.xyz/19650705382hnja4.pdfIn PDF document text
    • https://titoduxelet.weebly.com/uploads/1/3/5/3/135399046/nuzezov_bexiguni.pdfIn PDF document text
    • https://nojinogexosop.weebly.com/uploads/1/3/4/6/134695112/nuzejuberijorogute.pdfIn PDF document text
    • https://cdn.sqhk.co/wifurovud/hctDngj/wupevame.pdfIn PDF document text
    • https://fisupipegapug.weebly.com/uploads/1/3/4/5/134515512/7f3ce0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417813/normal_5fdacb5ab8aa3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530323/normal_5fc832a322ea0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369908/normal_5ff301ad44e8b.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/pomaxa/vujowanaxemazi.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagobomap/viverimigesuso.pdfIn PDF document text
    • https://s3.amazonaws.com/bawalidamovidud/asalem_jarigindante.pdfIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/aha_guidelines_valvular_heart_disease_pregnancy.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3A 5044 bytes
SHA-256: 10a65817ec9593dd86fed137ecb3784874bf073b86153f0fa012d8f42dac8847
font_01_sfnt_off0000e064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE064 1936 bytes
SHA-256: 246569b5fd7226bd0ebf3c016de7ba0bf82e996896d660a08030b2af0a08efd3
font_02_sfnt_off0000e9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A5 10368 bytes
SHA-256: 274b36b0d056a0aae73a13ad4104f742bd466a6768c0a5cc369d8425cffc7248
font_03_sfnt_off00010d3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3D 16944 bytes
SHA-256: d6b69e0b076685a2017ec3d0495784780ac99b328cb821c901e04638eb0d951a

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