Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc4af5176cb792c8…

MALICIOUS

PDF

65.6 KB Created: 2020-11-18 18:40:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 363ea4b4e30603627868275f7df085d7 SHA-1: 3ffca70313ad74b28838c2aa22faa380b3b3a257 SHA-256: dc4af5176cb792c8c8c2e955180859ef9280a6327610205d101657f3968e9714
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains heuristics indicating it is a malicious redirector and a brand-impersonation credential phishing lure for Amazon. It directs users to a malicious URL, likely to download a second-stage payload or present a phishing page. The ML classifier and ClamAV detection strongly support its malicious nature.

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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://zigizawinowola.weebly.com/uploads/1/3/4/4/134457077/9856438.pdf.
  • 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://traffking.ru/123?utm_term=the+dinner+party+by+mona+gardner+theme In PDF document text
    • https://zigizawinowola.weebly.com/uploads/1/3/4/4/134457077/9856438.pdfIn PDF document text
    • https://banavodix.weebly.com/uploads/1/3/4/6/134687022/3664630.pdfIn PDF document text
    • https://dedidolijara.weebly.com/uploads/1/3/4/6/134666782/jebukanaw_masazuxanusog_nixem.pdfIn PDF document text
    • https://ritibamubube.weebly.com/uploads/1/3/1/4/131437410/246704.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/zetare/40037777023.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdfd28c3-92bc-4097-a5bf-1bc31b7b26e0/free_download_wood_carving_books_and_patterns.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac54de56-4a2c-4da7-b3b5-daf71a67ec61/46019431732.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/velitabome.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/706_heads_cc_size.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b8fa537-ee75-4a98-b1a1-9dfd50c9d66f/38082080027.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9dd2580-a616-480e-aefb-0f5cfefb194e/88710308225.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3b8f5b2-7f66-4b19-b572-819ab422d0f3/fexedilenuwekavi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d57ddbd-1f01-4cff-af07-a956d9572858/phrases_damour_et_amiti_tumblr.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/12846252117.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_off0000c57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC57E 5352 bytes
SHA-256: bbff82dcd104d198a99c7c95b75ed20328f8ef38a46117f4aac1b36d0d74bf90
font_01_sfnt_off0000d78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78B 10008 bytes
SHA-256: c8d090494d81a7a60e8742f6ef5e61bf6c43d1e3ad9bec9be8fa14facb8fb59a

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