Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c6623f992dc235c…

MALICIOUS

PDF

80.3 KB Created: 2021-03-23 11:05:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 8d283ca3f47d4efb5a5a677af961ebeb SHA-1: 25de2233a229fe6d99af9407297c799f7faab3c4 SHA-256: 4c6623f992dc235cd6c5760dd72744bd084934cbc989df3ba06837416c93b083
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, a common tactic for phishing or directing users to malicious sites, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. ClamAV and ML classifiers also flagged this file as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the heuristic firings strongly suggest an intent to redirect users to potentially harmful content.

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
  • 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.
  • 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://bologen.ru/123?utm_term=sieve+analysis+soil+test+pdf PDF link annotation
    • http://gosejoligezo.iblogger.org/bootstrap_modal_form_input_focus.pdfIn PDF document text
    • https://dunijolojuk.weebly.com/uploads/1/3/1/4/131437931/7983748.pdfIn PDF document text
    • https://gegakavawedo.weebly.com/uploads/1/3/4/2/134265750/tilotejini.pdfIn PDF document text
    • https://lujukote.weebly.com/uploads/1/3/2/7/132712447/wojanojuzidelap.pdfIn PDF document text
    • https://cdn.sqhk.co/kisesawaropo/DgejjmC/talking_catfish_tank_mates.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465935/normal_5fcf0c86c5561.pdfIn PDF document text
    • https://cdn.sqhk.co/mujexoxa/iiciihc/cute_cat_hd_images_free_download.pdfIn PDF document text
    • http://wemedimixodi.iblogger.org/what_are_good_relationship_questions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411511/normal_602199d48bca3.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/lekelepowo/word_conundrums_with_answers.pdfIn PDF document text
    • http://vevisadoko.epizy.com/maithili_nach_program_sheet_basant_bhag_12.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/4k_3d_video_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kokesatodixon/wedding_certificate_templates_free_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/printable_cursive_practice_sheets_for_adults.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzakifezara/misisufaxuxesiferiduboxup.pdfIn PDF document text
    • https://s3.amazonaws.com/suzujewa/jasc_paint_shop_pro_5_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zibenoroduzuw/sewazalivotuzowugimif.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f03f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03F 4992 bytes
SHA-256: 0ab0bc5b90bd75a7e6a4a0500bd7ef76e5afc6ebc9d63fbf2233dada1eb10d73
font_01_sfnt_off00010150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10150 10148 bytes
SHA-256: 68a4f72191a360ad6edd4bd4074e22bf33e2789c2fd950b148382fab3c730253
font_02_sfnt_off0001241c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241C 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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