Malicious PDF — malware analysis report

Static analysis result for SHA-256 d96589e5a78aef8b…

MALICIOUS

PDF

68.1 KB Created: 2020-11-17 00:08:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: adc2c2ac50eeff4ae3a32c4dd93b2815 SHA-1: 8aa8c6a9d383db8fac964e5705d65911643f8fc2 SHA-256: d96589e5a78aef8b55167d6a0060c94f6250f98cc625d51cd9b80b38bd161df4
214 Risk Score

Malware Insights

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

This PDF file exhibits malicious behavior through a critical heuristic firing indicating it links to known malicious redirector infrastructure. Additionally, it contains a mass external PDF link farm, suggesting an attempt at SEO manipulation or redirection to malicious content. The ML classifier and ClamAV detection further support its malicious nature. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

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
  • 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.
  • 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://traffmen.ru/strik?utm_term=sample+affidavit+of+bona+fide+marria In PDF document text
    • https://welavofewefose.weebly.com/uploads/1/3/0/8/130813025/pejulesojaweti-rikipopunaxob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373243/normal_5f932efa53a38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414341/normal_5f9d070722166.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377102/normal_5f97736406de8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403421/normal_5f9d8678caf0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493610/normal_5faffce7881fb.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/midaguvimabof/aritmatika_sosial_smp.pdfIn PDF document text
    • https://s3.amazonaws.com/juzalizuvar/41682378875.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f8737ce-c328-4a09-b781-6ce4d06c9e62/97971269124.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/jafedobenaso.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/18652434508.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/59535416088.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/pakupenonubaka.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/act_testing_dates_2020_texas.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/7303049498.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_off0000cd4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4D 5312 bytes
SHA-256: 5976bc16b69685ffb584f81bdeff197cf3401ac755db10c3c6c0ae3b31683aca
font_01_sfnt_off0000df48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF48 10468 bytes
SHA-256: 95f6d57f3f13f54ebd6f89dce06edf4bf4cccb3b39dca3da95064871acefa78f

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