Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab3af434bd158e9b…

MALICIOUS

PDF

76.6 KB Created: 2021-03-31 22:56:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 0dd077f6ce72903bd1186bd232e63253 SHA-1: e6c6fc8c29d05e10e07d1d357f570995eeb44a79 SHA-256: ab3af434bd158e9b71f2a978d230d5e2a906e2e558714918478e031e8329cf09
184 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though partially corrupted, suggests a lure related to academic materials. The presence of multiple links and the use of a redirector indicate an attempt to lead the user to malicious infrastructure, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dafemum.ru/award?keyword=solutions+manual+for+calculus+a+first+course+pdf In PDF document text
    • https://cdn.sqhk.co/wememiguw/iijj5j4/recargas_a_cuba_ofertas_febrero.pdfIn PDF document text
    • https://cdn.sqhk.co/wexunaveb/chjibii/cartoon_wars_hbo_max.pdfIn PDF document text
    • http://dovulup.iblogger.org/nevejenerupevegim.pdfIn PDF document text
    • https://wizitizisib.weebly.com/uploads/1/3/4/3/134361222/xuraju.pdfIn PDF document text
    • https://garovinarabibaf.weebly.com/uploads/1/3/5/2/135293384/98cfeb2ec07de96.pdfIn PDF document text
    • https://doxeraja.weebly.com/uploads/1/3/1/8/131871607/f3d7627.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_0c7fe36cef3f4182be4b07d62505119e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/kewatediferadavilite.pdfIn PDF document text
    • https://76f5a3e5-08d8-4581-9975-6c1b933a1845.filesusr.com/ugd/dbbd16_38135b7a7ae444589bf45e110e2d284d.pdf?index=trueIn PDF document text
    • http://zalowakudedakov.rf.gd/51058398803.pdfIn PDF document text
    • http://bamemuwibe.epizy.com/jinorojesogopenoxe.pdfIn PDF document text
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_7adce376b9c74804a00904393f1184f5.pdf?index=trueIn PDF document text
    • http://lagokatu.epizy.com/88012357923.pdfIn PDF document text
    • https://b6de9e3f-c562-4e05-b5ee-70895c8060ae.filesusr.com/ugd/3801ff_1a65bd498ddf4c9aaef991414139b183.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/791b5fd7-b55b-4206-b34b-160122afeb59/smoothie_recipes_with_almond_milk_and_spinach.pdfIn PDF document text
    • http://mojabumenir.epizy.com/amarakosha_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40423a17-7fbc-4342-817d-00b7592ee3d6/a_supposedly_fun_thing_ill_never_do_again_analysis.pdfIn PDF document text
    • https://ab25a8b3-4d80-4d4b-93a1-c1347014fa7c.filesusr.com/ugd/8d0191_eab7bb6688b346ecabdf87a5458855d5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/different_types_of_cloth_materials_with_pictures.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_off0000ec72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC72 5404 bytes
SHA-256: 9ead4a2adc500459695278adba2fbe79af667678d602ecabdbf9db11e78005e9
font_01_sfnt_off0000feb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB6 11236 bytes
SHA-256: 66046bbdc9c89c55e85c2107d52d1cc790135c94b1657cceea03685afbd3a8e3

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