Malicious PDF — malware analysis report

Static analysis result for SHA-256 55815b27d5de0341…

MALICIOUS

PDF

77.8 KB Created: 2021-05-18 19:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 3404aae882148f8d6a4ed9c294f33431 SHA-1: d3bdc567968d7654dd959519815571a8976a5c0e SHA-256: 55815b27d5de03418b9048b3982d05c44ad62ab6452072c0a87f2539e1410155
156 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a phishing attempt and a link farm, with a high ML classifier score and ClamAV detection. The embedded URL points to a domain that appears to be part of a link farm designed to distribute potentially unwanted software, specifically mentioning 'Bandicam full version google drive'. While no scripts were directly extracted, the PDF structure and URL suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/strik?utm_term=bandicam+full+version+google+drive PDF link annotation
    • https://ginimowawogob.weebly.com/uploads/1/3/4/7/134753870/573a3ac95f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472774/normal_600b3a5173544.pdfIn PDF document text
    • https://nijubalalo.weebly.com/uploads/1/3/1/4/131453980/7870656.pdfIn PDF document text
    • https://puxokobipo.weebly.com/uploads/1/3/4/5/134524361/3fc41fa58.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473415/normal_5fe40323acfb3.pdfIn PDF document text
    • https://memibiwogiluged.weebly.com/uploads/1/3/4/1/134131866/9ea905fd455.pdfIn PDF document text
    • https://tepupareta.weebly.com/uploads/1/3/0/8/130814680/7276791.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/70ca6694-78f7-4b48-a821-a071403085c4/pesejilubewowoxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0122f72b-5dea-461d-9a90-4d9662f1ee96/budijomi.pdfIn PDF document text
    • https://s3.amazonaws.com/daxemo/guxapevotogusilugeku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccc7d149-59fb-415d-b840-05ca541aac08/what_is_psychology_class_11_physical_education.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/rirabo.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/27724489888.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/74812323441.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/73525898117.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_off0000f0ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AD 5452 bytes
SHA-256: 4cf7bf745ebf406b35fab5f1fc26034239b21e16c314c2f3cfb5a5cda4ca62cd
font_01_sfnt_off00010330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10330 10864 bytes
SHA-256: 3bac4282a26762e3bc71acee25ba9abb82ee0d071740160fcc70b24f846d3c56

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