Malicious PDF — malware analysis report

Static analysis result for SHA-256 91809605247c3987…

MALICIOUS

PDF

88.1 KB Created: 2021-03-14 00:32:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 7387381b192f2ed52d1f4524ac177a9a SHA-1: 057d450b29a94b6b6461669179a948e393fd6d1d SHA-256: 91809605247c398798a53d941bb39e69dcc5d66e9dee2f1d6948e3c958c5c975
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to suspicious domains and are flagged as malicious redirectors or part of link farms. The ClamAV detection and ML classifier further indicate malicious intent, likely for phishing or SEO abuse. No scripts were extracted, but the document's structure and embedded URLs strongly suggest it's designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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://crophysi.ru/123?utm_term=odisha+police+rank+pdf In PDF document text
    • http://zaxegod.getenjoyment.net/how_to_round_loom_knit_socks.pdfIn PDF document text
    • http://smeshnoykir.space/greek_and_latin_roots_worksheet_high_schoolyxead.pdfIn PDF document text
    • http://mastera-saydinga.ru/87426649802a6ykn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467004/normal_603e259e819e1.pdfIn PDF document text
    • https://vufuredupe.weebly.com/uploads/1/3/0/7/130776381/robam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376126/normal_603795a6bcb91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448540/normal_60133759548cf.pdfIn PDF document text
    • https://jobalexaxikut.weebly.com/uploads/1/3/4/8/134892204/3a3dd73504e4b.pdfIn PDF document text
    • http://ladujose.sportsontheweb.net/graphic_design_jobs_atlanta_ga_entry_level.pdfIn PDF document text
    • http://stopro.store/72596952287iuebd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/nubevosor.pdfIn PDF document text
    • http://pulutugorivexek.atwebpages.com/how_to_connect_logitech_wireless_mouse_to_receiver.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/free_arabic_worksheets_for_kindergarten.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/pure_data_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/assimilation_policy_australia.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/71650051372.pdfIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/how_to_make_my_own_anointing_oil.pdfIn PDF document text
    • https://s3.amazonaws.com/furunumaroxun/fisugebogabikonis.pdfIn PDF document text
    • https://s3.amazonaws.com/xomudufe/56990677081.pdfIn PDF document text
    • http://fotizojorirepel.onlinewebshop.net/45720900011.pdfIn PDF document text
    • https://s3.amazonaws.com/tufujifinobiro/lake_aeroflex_fishing_report.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF278 5336 bytes
SHA-256: 0f196307f9a685a8ff3a80e528f38a2699240d4c04f2127d913747809be604be
font_01_sfnt_off00010496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10496 11420 bytes
SHA-256: 7e0972b024f32b6c20377dce24054a9f53511abaca910152c1fa122c55266a44
font_02_sfnt_off00012bb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB0 16164 bytes
SHA-256: e296a61d2d303e35be9e1a35631556663d2780498efa7e8f3867bf557f172fe6
font_03_sfnt_off000140fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140FD 4444 bytes
SHA-256: e4e2f2a5a30337c9cf49e60a1dee252961197262b3191c69968e352fb8f4a357

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