Malicious PDF — malware analysis report

Static analysis result for SHA-256 b45d190e2fd1e324…

MALICIOUS

PDF

83.2 KB Created: 2021-02-13 19:21:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 8ec69eca9bfc11aaa0dfb496cc86885c SHA-1: ddf8959d5efb126e025944d8d264af6954665349 SHA-256: b45d190e2fd1e3246a28a59698de7589365b0c6c9d7750c8cff3f595186aaf7d
214 Risk Score

Malware Insights

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

The PDF contains embedded links, with one critical heuristic identifying a link to a known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to contain text related to a Cuisinart manual, suggesting a lure. The presence of numerous external PDF links, many pointing to S3 buckets, indicates a link farm used for SEO poisoning or distributing further malicious content.

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 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://yafferge.ru/wix?keyword=cuisinart+smart+stick+hb-120pc+manual In PDF document text
    • https://cdn.sqhk.co/pozusonitid/ibchiq8/juwebinaduwukij.pdfIn PDF document text
    • https://cdn.sqhk.co/viforoge/6ggheji/zunelotelererobarililab.pdfIn PDF document text
    • https://disaximineta.weebly.com/uploads/1/3/4/8/134883765/mokan.pdfIn PDF document text
    • https://cdn.sqhk.co/filodomazora/aib92mU/53795543020.pdfIn PDF document text
    • http://pr-bux.online/74949722486u7y38.pdfIn PDF document text
    • http://itawomen.fun/car_accidents_deaths_per_year_ukuts8c.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/feborobegibew/introduction_to_statistical_learning_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/fidobakipivogit/cfa_institute_research_challenge_winning_report.pdfIn PDF document text
    • https://s3.amazonaws.com/nuruvapozixix/video_er_app_for_android_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/getizar/betujerijunajosujan.pdfIn PDF document text
    • http://nupopejif.epizy.com/bollywood_old_mkv_movies_free.pdfIn PDF document text
    • https://s3.amazonaws.com/mijumomub/animismo_e_espiritismo_alexandre_aksakof.pdfIn PDF document text
    • https://s3.amazonaws.com/varoximu/vunudovunamiz.pdfIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/write_equations_in_word_form.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_off0000f310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF310 5412 bytes
SHA-256: 00ae60a3df31177a8c07beacd46ed26c218d3e25f3bfe8833a251f4fc9c4447e
font_01_sfnt_off0001054a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054A 13692 bytes
SHA-256: e0689c8d79c14837f1b31881a6d05ebab0668b6c8144a36ddbf74352daf75ac5
font_02_sfnt_off0001318c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1318C 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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