Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1dda8ece72460dc…

MALICIOUS

PDF

81.0 KB Created: 2021-01-05 06:03:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 359840321830586d4d19a860aa4db598 SHA-1: 7377c607aeeafcedbb6451b052df684203791426 SHA-256: e1dda8ece72460dcd9df0c7d0c10bf52a839ffd4f25c90961cfc6c4ab8aad95d
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to redirector infrastructure or potentially malicious domains, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://cctraff.ru/aws?utm_term=acute+rheumatic+fever+guidelines+aha In PDF document text
    • https://fejamelaluboj.weebly.com/uploads/1/3/4/3/134311679/e63c254a40.pdfIn PDF document text
    • https://cdn.sqhk.co/sigidezok/eighfhc/12523142505.pdfIn PDF document text
    • https://cdn.sqhk.co/sozaxejiv/ojghdgd/bubble_waffle_cafe_ironwood.pdfIn PDF document text
    • https://lonegaru.weebly.com/uploads/1/3/0/9/130969637/5b9919c9e.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefimex/idZ2Sjf/pifekinaze.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/cbb37878-9f56-4193-8aca-53c7d01a7ce2/8160794183.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/39212297206.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagobomap/10307090461.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0202274e-b430-4c3d-95a6-ad7ddebb680c/58383172796.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/96994790746.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1552dbc6-3446-4311-83ba-eddc578c23c3/lego_duplo_around_the_world_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/878e62b4-227d-4790-8aa4-70b00c7f3fc2/zemofopumegopoxirali.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1fea5ab-c2fe-4a05-af18-11af0285bf15/vishwaroopam_2_telugu_movie_online_w.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BF 5256 bytes
SHA-256: 3b79678495752e90d7d7b978b1439f5c00334ca33616f3c5ad4eb4ceeb3297fb
font_01_sfnt_off00010280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10280 10768 bytes
SHA-256: d77e4a9573586ff461600bb3ad6bb6c734fe5c82e962b47bfde88bdf00ba427c
font_02_sfnt_off00012748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12748 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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