Malicious PDF — malware analysis report

Static analysis result for SHA-256 21dd9878c8d59178…

MALICIOUS

PDF

67.7 KB Created: 2021-01-12 10:41:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 07c72f5b26e600f7a4ef3dbf9db9a54c SHA-1: 985daee25dcefc27dab74c3ebee79649f9eac794 SHA-256: 21dd9878c8d591783911bc8012ea7df7316957ffac1cf74724a627b2099fb1f0
184 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirector infrastructure, specifically `https://gettraff.ru/123?utm_term=lab+technician+resume+objective`. The document body, though heavily obfuscated, suggests a lure related to a 'lab technician resume objective'. The presence of multiple links to disposable hosting and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate a phishing or malware distribution attempt.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gettraff.ru/123?utm_term=lab+technician+resume+objective In PDF document text
    • https://cdn-cms.f-static.net/uploads/4487626/normal_5fae87cbef5e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380082/normal_5fa9400861586.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386333/normal_5fa714588a17d.pdfIn PDF document text
    • https://site-1166598.mozfiles.com/files/1166598/40118687532.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459321/normal_5fcfaf259c888.pdfIn PDF document text
    • https://site-1178749.mozfiles.com/files/1178749/64408295222.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413564/normal_5fe152104f659.pdfIn PDF document text
    • https://nifubadipapa.weebly.com/uploads/1/3/4/3/134388301/ravibamexute.pdfIn PDF document text
    • https://site-1177705.mozfiles.com/files/1177705/38098018006.pdfIn PDF document text
    • https://site-1171990.mozfiles.com/files/1171990/cisco_netacad_chapter_3_exam_answers.pdfIn PDF document text
    • https://site-1174103.mozfiles.com/files/1174103/juwadororekev.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/potofaw/sales_report_headlightmag.pdfIn PDF document text
    • https://s3.amazonaws.com/tekujel/69909525931.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_off0000ca8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8D 5224 bytes
SHA-256: 75bc27ea897cec26c792323d4a2381ce53d6927c5548320ddb142608724250d1
font_01_sfnt_off0000dc32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC32 10712 bytes
SHA-256: 5612a95e4d678fd096b77596411a64a5ce0e76f2e0e986f7bb56bcbaef4fc7ae

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