Malicious PDF — malware analysis report

Static analysis result for SHA-256 66d72acbdb6a308b…

MALICIOUS

PDF

86.5 KB Created: 2021-01-21 01:46:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 8db24a4f1b46f007c0835d79d8c86f76 SHA-1: ebd95ec4a3cc0e17a1fae4cdd2e376c806925096 SHA-256: 66d72acbdb6a308b7017d89617998f39e4f592d97b0b7297a7ff893eaebbbe09
214 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to redirector infrastructure or link farms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. The document body, though heavily obfuscated, contains text related to free downloads, aligning with a lure for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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?utm_term=free++whatsapp+status+punjabi+song In PDF document text
    • https://ruzutemeba.weebly.com/uploads/1/3/2/6/132681300/wijuporajukatere.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463788/normal_60030ddbe0ce0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370555/normal_5f8a1a7e7bb28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387918/normal_5fa194d3b2588.pdfIn PDF document text
    • https://cdn.sqhk.co/motulobugaji/iihh8Lq/wigegudojojutegedof.pdfIn PDF document text
    • https://cdn.sqhk.co/niserutom/gy22rfS/saudade_band_wiki.pdfIn PDF document text
    • https://nerutemiwuxofa.weebly.com/uploads/1/3/1/3/131398157/4c21b9f720307.pdfIn PDF document text
    • https://tusidotug.weebly.com/uploads/1/3/4/4/134482214/rilamabifevup_totilumak_jebujibas.pdfIn PDF document text
    • https://site-1172154.mozfiles.com/files/1172154/37515500129.pdfIn PDF document text
    • https://site-1175138.mozfiles.com/files/1175138/fapulazapeveru.pdfIn PDF document text
    • https://cdn.sqhk.co/wokowuvawuz/gjdijig/jobezujive.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372076/normal_5fdbe31ba6b17.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://s3.amazonaws.com/jedobufudajewu/fusube.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/amorphous_and_crystalline_solids.pdfIn PDF document text
    • https://s3.amazonaws.com/bepukuba/5336538654.pdfIn PDF document text
    • http://dobejul.epizy.com/67892620616.pdfIn PDF document text
    • http://nifekubipaxo.epizy.com/rejection_analysis_report_format.pdfIn PDF document text
    • https://s3.amazonaws.com/sabobenuwe/10990214940.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/iet_cpd_template.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_off00010982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10982 5196 bytes
SHA-256: 405dd86120173b4c3424bee870601eb2a474bff8740968934c1343c94984fd74
font_01_sfnt_off00011b39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B39 10596 bytes
SHA-256: 93b6e364ca3459dec9036a15fc7d52584bb49af9dc83ff1f3dd5d9cf5b10da15
font_02_sfnt_off00013ea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EA5 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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