Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c5118951020f921…

MALICIOUS

PDF

67.9 KB Created: 2020-12-19 17:55:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 5ded35608f544f36502dbc6d3e8a77cd SHA-1: b85683d365a7f95f2a4273f4717c1c4290f36f1e SHA-256: 4c5118951020f9219728aec4b9ded99cbfbe43077f2e3efa16cc843728915213
216 Risk Score

Malware Insights

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

This PDF document is identified as malicious by multiple heuristics, including brand impersonation for credential phishing and a link farm. It contains an external URI pointing to a redirector URL, likely part of a phishing campaign. The ML classifier and ClamAV detection further support its malicious nature.

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
  • 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.
  • 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://puwukozo.weebly.com/uploads/1/3/4/5/134587621/2585684.pdf.
  • 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://traffnew.ru/aws?utm_term=criminal+record+check+vancouver+form PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4403687/normal_5fd0835d1b312.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499341/normal_5fcf1b4a7192f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414342/normal_5f969d76750ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403274/normal_5faaf0307afd6.pdfIn PDF document text
    • https://puwukozo.weebly.com/uploads/1/3/4/5/134587621/2585684.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393016/normal_5f95a09bbf0fd.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/15461d04-0280-4123-bcbe-e6f22966c410/26730151465.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5aab790f-55a5-497f-ba88-486c739a7e2d/st_martin_de_porres_lay_dominican_community_new_hope_ky.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c005914-78ae-4d36-ba8d-b23eca4ae5a0/mass_effect_2_dlc_authorization_crack.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/appliance_center_maumee_ohio_ad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20e97132-54c1-4d27-8d10-82b4c3ea81c9/65054281671.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_off0000cab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB8 5112 bytes
SHA-256: 494129d3da1acb21fb12d59a0298221e61828593c073f42dfaac91d435c8f940
font_01_sfnt_off0000dbee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEE 10780 bytes
SHA-256: f81c107244e8e800b5b397f69c58a12caaadb7c1ecd50fd927e119b887d608cc

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