Malicious PDF — malware analysis report

Static analysis result for SHA-256 af789d8b2d7f4f36…

MALICIOUS

PDF

74.6 KB Created: 2021-01-06 02:56:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 130b44a53249f7ca42f0c46427c50a07 SHA-1: 720a9ef3bd6c7eca8a76c426657f8355c2d106d1 SHA-256: af789d8b2d7f4f36466d48a74c1bab544cde6fc95d21aa0691db4f22c8d8aaea
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous external links, including one to 'trafffe.ru', suggesting an attempt to redirect users to malicious content. The presence of embedded links and the overall structure point towards a phishing lure disguised as tax forms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffe.ru/aws?utm_term=amberley+village+ohio+tax+forms PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4445531/normal_5fef8b329aec4.pdfIn PDF document text
    • https://cdn.sqhk.co/sewoliwadumi/aidiN1A/megan_rapinoe_jersey_sales.pdfIn PDF document text
    • https://bemetezebore.weebly.com/uploads/1/3/4/8/134882820/7082261.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391037/normal_5fe9244719489.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/pugomonapoxuxe/71589224091.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/22441357997.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/android_barcode_scanner_as_input_device.pdfIn PDF document text
    • https://s3.amazonaws.com/roxawo/broncho_vaxom_sache_bula.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99dd79ef-87e0-4f92-9393-a5c2fa5a5886/takadamulelivifudalum.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_off0000e687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE687 5540 bytes
SHA-256: 6b76ccc4908d257ff62ac69ba10bc2a98c3b81ccffeb1efee4564a29c07a53b0
font_01_sfnt_off0000f942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF942 10760 bytes
SHA-256: 6fb5dad7ed1afd7cac377b0c35bf209835056e41522208364a5a1a7cf587fe16