Malicious PDF — malware analysis report

Static analysis result for SHA-256 7226b02cc4c54051…

MALICIOUS

PDF

77.3 KB Created: 2021-02-07 06:08:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 66757cae2ce254bbdb3d55b3fc84fcab SHA-1: ac6525117eae8206f56666ed310f82387647f90a SHA-256: 7226b02cc4c540519a7a049b2b6622e37515be83e2065fe623e3dfc287525d42
254 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to suspicious or malicious domains, including a redirector and a domain used for collaborator client interaction. The document body is heavily obfuscated but appears to be a lure for 'Whatsapp business for pc windows 10', suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://yafferge.ru/aws?utm_term=whatsapp+business+for+pc+windows+10 In PDF document text
    • https://pijusutuwo.weebly.com/uploads/1/3/1/4/131407307/cd1bf2.pdfIn PDF document text
    • http://buyervannakupitvsem.xyz/cacti_templates_cisco_switchzc3eb.pdfIn PDF document text
    • https://logesili.weebly.com/uploads/1/3/5/3/135389335/5302498.pdfIn PDF document text
    • https://kofovozeregom.weebly.com/uploads/1/3/4/3/134313602/rutuz.pdfIn PDF document text
    • http://securityofusersdevicesonline.site/burp_collaborator_clientaytza.pdfIn PDF document text
    • http://weraka.online/accounting_texts_and_cases_13th_editionm091b.pdfIn PDF document text
    • https://nanavefog.weebly.com/uploads/1/3/0/7/130775134/a6084406d02.pdfIn PDF document text
    • http://bosnoslovnoejelaniekupit.xyz/59086416883smh8r.pdfIn PDF document text
    • http://eurostore.info/57218985694tpjij.pdfIn PDF document text
    • https://fojakejozu.weebly.com/uploads/1/3/2/7/132712415/gasapegube.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/wazotojemov/dosage_of_metformin_for_prediabetes.pdfIn PDF document text
    • https://s3.amazonaws.com/feliso/46848363264.pdfIn PDF document text
    • https://s3.amazonaws.com/xiwevitox/1623303232.pdfIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/95649083325.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/alien_shooter_free_apk_obb.pdfIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/90707172841.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/nijurimebefetivopifejo.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/85240996922.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE007 5532 bytes
SHA-256: fd76a6544774d375b3669d64bcd06a854e99b84b6c27888ae608bc4665ea8583
font_01_sfnt_off0000f2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D9 10920 bytes
SHA-256: cb9c8d9cd6e0e5241054e8b81566da3204f665d3ea720e73ffe7568ea799dca4
font_02_sfnt_off00011836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11836 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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