Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c914ea4afdecb4e…

MALICIOUS

PDF

103.7 KB Created: 2021-02-25 22:04:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: b8f70c781e27e281e15313726310ec5f SHA-1: ce4a50fff7744005d646ceea3ef052a866edfa85 SHA-256: 4c914ea4afdecb4ec661ca356ab0408716f73ab8e6291043baffc035f1d49832
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text related to 'chemistry dimensional analysis worksheet', likely a lure to entice users to click on the embedded URLs. The presence of ClamAV and ML heuristic firings further confirms its malicious nature, likely serving as a dropper or redirector to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://jottigo.ru/wix?keyword=chemistry+dimensional+analysis+worksheet PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4383131/normal_5fcb142d876f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370778/normal_602999cdb0dcb.pdfIn PDF document text
    • http://fadekitexef.iblogger.org/95122700704.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4529281/normal_5feb9e6bdb465.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420250/normal_6015573466b27.pdfIn PDF document text
    • https://menegelobeka.weebly.com/uploads/1/3/4/9/134903334/muzutikexi-rusemeret-kenutobos-xosutoz.pdfIn PDF document text
    • http://pixilapusir.22web.org/matlab_plot_vertical_line_with_label.pdfIn PDF document text
    • https://devarewiwigunum.weebly.com/uploads/1/3/2/7/132710712/tudobobegagegoni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479715/normal_603365bb1671c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406454/normal_5ff9c75d39130.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405186/normal_602f16fd8cc48.pdfIn PDF document text
    • http://c-advance.space/que_son_los_lexemasr51gl.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/divelatoxa/pazowosugaxiboz.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/lokufuwegitozupufosiva.pdfIn PDF document text
    • http://bamasagure.epizy.com/ultimate_book_of_accountancy_class_12.pdfIn PDF document text
    • http://zijuzul.epizy.com/mupumesapisudo.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_off00015213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15213 2828 bytes
SHA-256: 3b89a1333aa93e194de12c5c5da229a8f3a969ace6b07a90c5323b9ece6747ec
font_01_sfnt_off00015c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C0E 5228 bytes
SHA-256: e87a677d74cd473c65db5ef1501dd5e6c0168307fe2366f6e78ef0c992692eaf
font_02_sfnt_off00016db5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DB5 10308 bytes
SHA-256: e686149fc59619d990f081d7719c43b73b17123640e63fc984ff02095b5d042e

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