Malicious PDF — malware analysis report

Static analysis result for SHA-256 e78267b6d0ebcdd1…

MALICIOUS

PDF

92.6 KB Created: 2021-03-06 07:20:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0f6a642303fe9b10ef50c0abaa200eee SHA-1: dc06b327cae7f98f34cecb659b819a82be9c7e52 SHA-256: e78267b6d0ebcdd148acd68bad4b0ed6b2c1f0be290121ece63f71c0919a5fe1
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/award?keyword=how+to+add+with+different+exponents PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4493200/normal_6006675c478fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462339/normal_603f06c5c1d94.pdfIn PDF document text
    • http://copyright-infringement.business/sejakotixazebovikapiwitn1r.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456687/normal_60078ab7a7c80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369663/normal_60244920d8859.pdfIn PDF document text
    • http://startask.ru/review_of_powermax_treadmill3watc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468828/normal_5fe18ad4d3f54.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501998/normal_5fc5cbf3b7577.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://uploads.strikinglycdn.com/files/0ca7a303-ce13-4c9b-b3f7-fc9b9bf0b422/norcold_fridge_error_code_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da20a6a2-ea55-430e-a45e-a910e2d3e38e/dedigezinuzikozapo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6bd0bd8-4bc1-4c3c-b0a9-7d1fc19e34fa/how_to_shade_with_pencils_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/anet_a8_vs_creality_ender_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02a92c07-e27f-4011-9b4f-2bd4a095bb95/sat_normal_score.pdfIn PDF document text
    • http://fojoxolizono.rf.gd/toefl_writing_task_1_sample_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/fagubufusezegofokipikanox.pdfIn PDF document text
    • http://rixuzomobe.epizy.com/67464618361.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3a31878-fb23-424a-97e1-f8ed27ad0bc9/will_baldurs_gate_3_be_coop.pdfIn PDF document text
    • https://s3.amazonaws.com/bivanud/63358043622.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_off0001003d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003D 5004 bytes
SHA-256: 4e76557909081e7787362b74110eeadf5e98cc8365078b802de809284f0cbd5b
font_01_sfnt_off00011144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11144 15268 bytes
SHA-256: 58007c5c91c66cea281587da492e8c49af82abfe9b54b678b83a67d47d8baaa7
font_02_sfnt_off00014223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14223 16060 bytes
SHA-256: 84d5bd19c210eb3b73ecc14096ab1e56fdfb5b80ce7ba4f0052c67c0c2b02727
font_03_sfnt_off000156b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156B6 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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