Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0334b422c81577b…

MALICIOUS

PDF

72.8 KB Created: 2021-01-08 07:35:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: b810a16b6e34719f164600d71c0713a0 SHA-1: e035de9df20e2afaa3d0589dbc203c79a5e43907 SHA-256: a0334b422c81577bfb7ffaf8755754c7244e388df8f1f6c211015acbe78ea5e6
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged as malicious by multiple heuristics, including a critical finding for a link to known malicious redirector infrastructure. The ML classifier also assigned a very high probability of maliciousness. The embedded URL points to a redirector that likely serves further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ggtraff.ru/aws?utm_term=newspaper+dictionary+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4386842/normal_5fb668665019f.pdfIn PDF document text
    • https://fapusazi.weebly.com/uploads/1/3/4/8/134849501/voviwil_gabezakosebe.pdfIn PDF document text
    • https://cdn.sqhk.co/pozuwifofub/eEb1ign/84838083569.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486350/normal_5ff04c8637600.pdfIn PDF document text
    • https://zukutalemuz.weebly.com/uploads/1/3/4/5/134582669/a72c478.pdfIn PDF document text
    • https://lapawiniposa.weebly.com/uploads/1/3/5/3/135323982/e6285405e48f2fb.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/b32ac468-556c-41e1-b9af-207ed148dda5/balancing_act_model_1_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/36391019922.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c524185b-acf6-4aaf-ab49-78411e05d953/johann_wolfgang_dbereiner_triads.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/tegiwiwokikobatolojozine.pdfIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/60347864615.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_off0000df61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF61 5280 bytes
SHA-256: efe0fdde063d3584b21ee36288c475ec071de7feb55c62bd68f634aa3132e853
font_01_sfnt_off0000f187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF187 10948 bytes
SHA-256: f09518b81a6e498ff37c847dbf6d1752ce60565bd6da2ed711f0c7fc9c6999de

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