Malicious PDF — malware analysis report

Static analysis result for SHA-256 9df85ea53c72e782…

MALICIOUS

PDF

76.5 KB Created: 2020-11-10 07:57:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 00b164a1087cda517033ec3fa1f421d7 SHA-1: 57e21ee2550cdaa13c99a8957ee3a2c11008574e SHA-256: 9df85ea53c72e78266545afdc6aea79b80fd028e67c52db82ef725cf33727d5f
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one identified as a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting the document is designed to drive traffic to other sites, potentially for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://ggtraff.ru/aws?keyword=facts+on+middle+adulthood In PDF document text
    • https://lanasasaf.weebly.com/uploads/1/3/0/8/130815311/c84fdaeebb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368246/normal_5f8eced82560c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369182/normal_5f987c0f593f0.pdfIn PDF document text
    • https://fifowekuvepu.weebly.com/uploads/1/3/0/7/130776735/vided.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366976/normal_5f873701655b7.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/38c555bb-3f4b-4b0c-a90a-d0a87be7f059/kudiduri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcfeb0b2-d3c8-4512-a152-f03324ac6c3b/james_berryman_obituary.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/plants_vs_zombies_3_mod_apk_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/751435fb-f428-41c6-8875-57ae6a749cdb/42398997477.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4101db89-9956-4034-a917-addf1bb9cb41/85193045407.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34930c81-f6de-4832-b5f3-73122a216a0e/vagivigejajuxoxabanizowu.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_off0000f12c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12C 5036 bytes
SHA-256: 2cc9a4f8d92cf4dd851d29833800874bf9ae13dcfbfb846096d39e97944af441
font_01_sfnt_off00010224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10224 10424 bytes
SHA-256: dffb2000e706de63baec426aaa47d4b06ea30330cbbea5f9a6700a973eb647ac

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