Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ef50da33793f00a…

MALICIOUS

PDF

101.8 KB Created: 2021-02-22 14:02:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: b9a4af35a81d80217a6348247329156e SHA-1: 9dfa79ba2695a7d86479b253aaebc2b3e1d5c058 SHA-256: 2ef50da33793f00a3a7cd8d3f078b2643a995c9b04246d511720373197ab3543
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM' containing 30 external links. The primary malicious URL identified is 'https://jottigo.ru/strik?utm_term=list+of+all+data+structures+in+computer+science', which is likely used to redirect users to a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jottigo.ru/strik?utm_term=list+of+all+data+structures+in+computer+science PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381081/normal_602ecc56865d7.pdfIn PDF document text
    • https://cdn.sqhk.co/kivuwutu/Chdshe4/sales_best_books_to_read.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471250/normal_5fe98be942ff3.pdfIn PDF document text
    • https://sevimuxeso.weebly.com/uploads/1/3/0/7/130739978/zamuzivoma-bokenoxepakakiz.pdfIn PDF document text
    • https://cdn.sqhk.co/wibetaxor/dugdWO3/evolution_2001_dvd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473963/normal_5ff4273db132e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478415/normal_60278e1e9a1dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495694/normal_60233de4d0cc5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409123/normal_5ff6618ad84f1.pdfIn PDF document text
    • https://cdn.sqhk.co/filovixedalu/do3gEhV/lamomunoge.pdfIn PDF document text
    • https://cdn.sqhk.co/numokafas/x5tRgfB/23045529230.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454435/normal_6013a12858990.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529149/normal_5fd3c499bcb23.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/zowibatev/tisuka.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/fugunegibekaxev.pdfIn PDF document text
    • https://s3.amazonaws.com/nilititonawafim/aruvam_movie_tamilrockers._ws.pdfIn PDF document text
    • https://s3.amazonaws.com/wizakokowe/hamburger_roll_nutrition_information.pdfIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/big_wild_aftergold.pdfIn PDF document text
    • https://s3.amazonaws.com/bufipevuril/99713474516.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_off000129dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129DD 5124 bytes
SHA-256: 1541aeaf1f2bb513618df0300d43447a360c921855ecb569c893b53c3a2828e5
font_01_sfnt_off00013b28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B28 12224 bytes
SHA-256: bf93852cebd03a2027ab44ce716ea301cea4056093791efbf8dc072591b69fc6
font_02_sfnt_off000163ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163CA 17060 bytes
SHA-256: 8a4649b7f9ee74b492c0fb52d8d800d754d70725c7f16d4e4d218d103900513c
font_03_sfnt_off00017ae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AE2 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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