Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7cddf7d531a7ade…

MALICIOUS

PDF

71.5 KB Created: 2020-11-18 23:15:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: f7468cdd5721aa84feaf7ef075fb5e8d SHA-1: e979a3e3449c9e8629a3a214445864c937279a9d SHA-256: a7cddf7d531a7ade9f1c52df4d5044254faa36c1ef8a6d3a76a820064de9dc2b
204 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a heuristic indicating a link farm and a lure for a password-protected archive, suggesting an attempt to trick users into downloading a payload. The embedded URL 'https://trafftec.ru/strik?utm_term=stop+shop+hartford' is a primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafftec.ru/strik?utm_term=stop+shop+hartford PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366976/normal_5f8cacc84c50f.pdfIn PDF document text
    • https://joverukaded.weebly.com/uploads/1/3/4/4/134433057/2268088.pdfIn PDF document text
    • https://redawisifakaw.weebly.com/uploads/1/3/4/4/134481039/dutan.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/nojof.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/7155d0a2-6043-4ffb-867b-aff5a86b6191/35303095769.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14581c14-534d-4ed1-b112-1b99b7dc170f/60200263729.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bdfc2f4-7c45-4cdc-88eb-1043dc65e698/gisagalexiluwar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1389b440-8648-415f-8247-54afadfc04d1/caterpillar_3208_parts_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/353e70c8-d37e-4ae0-969e-3d3d69320149/free_avast_driver_updater_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0393f77d-03d6-457a-b955-93ceebfc127b/wesagupijedovuwogeda.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_off0000dab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB2 5200 bytes
SHA-256: ce91bdd4997cbc94d068cea1942c2322084485a591c42288ff7f6c81ebf599dc
font_01_sfnt_off0000ec59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC59 10944 bytes
SHA-256: ed264315f6726f9077a3e8ecaa9d409a4a29f7a45527fd317255ffac0afc17c6

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