Malicious PDF — malware analysis report

Static analysis result for SHA-256 319c1f0c4541cee8…

MALICIOUS

PDF

72.4 KB Created: 2021-02-28 18:51:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 86942b513ca7e166cf38e8e0c45f6c3b SHA-1: ae2a0cc68d26e6622dff06febdd56dcbec65e8bb SHA-256: 319c1f0c4541cee866e03f5238821ba5ba772b12c192a3cfca900d67932ba074
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to link farms and potentially malicious domains. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting an attempt to drive traffic to other sites. The presence of ClamAV detection and ML classification further supports its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gimoguvi.ru/strik?utm_term=irobot+braava+380t+advanced+robot+mop+review PDF link annotation
    • https://sojenakituvewo.weebly.com/uploads/1/3/3/9/133986345/9864028.pdfIn PDF document text
    • https://felilediwifagid.weebly.com/uploads/1/3/1/4/131453780/tawiko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506159/normal_5fdb27dc52606.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392210/normal_601ecaff544ae.pdfIn PDF document text
    • https://deremorukoj.weebly.com/uploads/1/3/4/4/134490203/a172436d46.pdfIn PDF document text
    • http://knitfqph.site/developmental_biology_gilbert_12th_e5ncfb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444866/normal_5fdac50d7a8e4.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/sixolose/boxujisokujot.pdfIn PDF document text
    • https://s3.amazonaws.com/gudukupir/comberton_village_college_ofsted_report.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/ocean_eyes_billie_eilish_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/zulezov/fundamental_accounting_principles_volume_1_answer_key.pdfIn PDF document text
    • http://totawog.epizy.com/how_to_write_internship_report_introduction.pdfIn PDF document text
    • https://s3.amazonaws.com/gazitif/lopojeravojujexiw.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DD 5740 bytes
SHA-256: aadd9c48e0da8678f50582d5047be9e81c9ea2ed1bc2c6075a621d7b04e5cae9
font_01_sfnt_off0000ed57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED57 11156 bytes
SHA-256: da131403656114bb00802379ed289e2c91a849043035a5924e98c02abc79d606

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