Malicious PDF — malware analysis report

Static analysis result for SHA-256 80c4d3b0ba7e970e…

MALICIOUS

PDF

103.0 KB Created: 2021-03-28 17:36:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a891404d8554178aa356d099397325c3 SHA-1: 9e98e5a10e1298237f4605df0d7ad67ef54e00da SHA-256: 80c4d3b0ba7e970eff802a0e7c21c7bcbfce1d9aa61c5a26d1eeaeddeb142612
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the presence of malicious links and the document's structure suggest it's designed to lure users to harmful sites.

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 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.
  • 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/aws?utm_term=oracle+12c+sqlplus+set+commands In PDF document text
    • https://cdn.sqhk.co/wunokebewoz/S5WjheU/81939756485.pdfIn PDF document text
    • http://zixudivibudizu.scienceontheweb.net/55923536842.pdfIn PDF document text
    • https://sidugavumudoriz.weebly.com/uploads/1/3/4/9/134902227/lujabikoxikatoj_nunevo_bowovaguropome.pdfIn PDF document text
    • https://cdn.sqhk.co/menasimax/ge3hfjd/vusovolanafosigiv.pdfIn PDF document text
    • http://pofaduxiruk.getenjoyment.net/lapesebuzilalem.pdfIn PDF document text
    • https://jaxenexeleti.weebly.com/uploads/1/3/5/3/135320290/91f952b2f17d204.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447878/normal_5fc7259b955ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420245/normal_6010e13fd0c98.pdfIn PDF document text
    • http://midunetojonawiw.mywebcommunity.org/what_food_should_i_eat_with_ibs.pdfIn PDF document text
    • https://zamamuxito.weebly.com/uploads/1/3/4/2/134234866/tifetefelukekof.pdfIn PDF document text
    • https://ravodesukifalav.weebly.com/uploads/1/3/1/1/131163780/e61e56450d4530.pdfIn PDF document text
    • http://nopiwez.22web.org/voxuxiw.pdfIn PDF document text
    • https://cdn.sqhk.co/jevamivuvugi/fmnjiu1/tux_racer_speedrun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nebojemesiwi.atwebpages.com/21808059077.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/posesemosate.pdfIn PDF document text
    • https://s3.amazonaws.com/gogoxowiniza/design_patterns_in_swift_5.pdfIn PDF document text
    • http://lawaxisagiwog.atwebpages.com/what_is_the_best_school_in_puerto_rico.pdfIn PDF document text
    • http://xezogime.epizy.com/67932585909.pdfIn PDF document text
    • https://s3.amazonaws.com/jigezilor/whirlpool_washing_machine_manual_top_load.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/kohler_dtv_mode.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000155d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155D8 5556 bytes
SHA-256: 64f393bc3761ae99f97f586c73989f4b5fbaf903a5da06e16ada35bc1f0a0023
font_01_sfnt_off000168a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168A4 10972 bytes
SHA-256: 05395b00303d0d853500de9e4cf3983300b4cb4a9497661a6a85b102b6442960

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