Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4e9eeb4e414aede…

MALICIOUS

PDF

92.8 KB Created: 2021-03-30 20:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 516de0231e802fdf5800ee365beb0450 SHA-1: 2eb1c89566ea9749f2dda6f3d34bc79e117254b7 SHA-256: a4e9eeb4e414aede262b390dab67b14bd49796331bd9ebaf930a94e100948640
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, with one pointing to 'https://kuzutuzo.ru/strik?utm_term=high+middle+ages+slideshare', suggesting a link farm or phishing attempt. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate the document is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/strik?utm_term=high+middle+ages+slideshare
    • https://cdn.sqhk.co/pamavunawi/uv8hfYq/comprehension_worksheet_grade_2.pdf
    • https://cdn.sqhk.co/farafakilof/ibVjbMM/46704816252.pdf
    • https://xazopitanajemav.weebly.com/uploads/1/3/4/7/134714933/5525151.pdf
    • http://levelupguild.com/35696906837l6jnb.pdf
    • https://datugabow.weebly.com/uploads/1/3/4/7/134745554/zaporawepof_zezaluzibude_bomugavemakife_kiraladoxavetu.pdf
    • https://nimivisedasefu.weebly.com/uploads/1/3/1/0/131070972/guvodokumez_sepavomofoje_wijiduvow.pdf
    • https://sedifuwenute.weebly.com/uploads/1/3/4/4/134464273/9bbda1f.pdf
    • http://kirivil.iblogger.org/las_capas_de_la_atmosfera.pdf
    • https://pimizotola.weebly.com/uploads/1/3/4/7/134770615/tiwonodivafimuk_jobubap_xukutojip_nodolizora.pdf
    • http://natlab.ru/york_electric_furnace_manualsvjinu.pdf
    • https://cdn.sqhk.co/bebumula/Nhf0jil/kikekajonevezomorazunon.pdf
    • http://laithub.pro/90701923750khffh.pdf
    • https://sejesomizibiji.weebly.com/uploads/1/3/5/3/135346687/6935474a.pdf
    • http://ig-copyrightnotice.com/tugufododupasukafiri8x98g.pdf
    • http://ins.expert/piggy_cut_rope_gamezuykp.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2c9641c8-5874-4869-9b94-f1378e60aa6b.filesusr.com/ugd/efc1f6_0a74763a34eb4ed0ac0826e3b13ae6c3.pdf?index=true
    • http://wemuvolelotufe.epizy.com/spanish_grammar_tenses.pdf
    • https://e5baaea7-7007-41de-9367-4ebf3ed55875.filesusr.com/ugd/8e1900_4699d381027c4c46a4c80cdb6cea115b.pdf?index=true
    • https://ea0a6730-5b47-42bc-899c-5b27b21b32ea.filesusr.com/ugd/184298_cb4f1854446c45be95a737653ac20475.pdf?index=true
    • http://devepovamijube.epizy.com/99302338248.pdf
    • http://zudujijikaj.rf.gd/how_to_work_a_singer_promise_sewing_machine.pdf
    • https://4ac36a2f-1533-488b-b282-cf34cdace458.filesusr.com/ugd/bcfc12_f134a53f647845e28a3a33a9fda95f9e.pdf?index=true
    • http://rabopakuzu.epizy.com/bharti_axa_general_insurance_policy_download.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012157.bin
760c3e61464fa907f39484dba88b206300aa8812e2b6de05d662afe3c3f95eef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12157 2728 bytes
font_01_sfnt_off00012cde.bin
c5c2466a46145783d9e79a53f7da74c5808c518b9daf50afbd825b0ed9a94be5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CDE 5200 bytes
font_02_sfnt_off00013e5c.bin
d843db1d542b8f0eb44e8cea2cc7f0d62b4244c63747f6396d034b90f0bd814a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13E5C 11384 bytes

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