Malicious PDF — malware analysis report

Static analysis result for SHA-256 e141daa90d19418d…

MALICIOUS

PDF

67.7 KB Created: 2021-04-15 09:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 0e3af61036b33fc8d351b51d65252e60 SHA-1: d03a25d32f307d68ed86f404d14167aee6fed590 SHA-256: e141daa90d19418da0b749d4ada9d40821ee6067f407c87b1ea5e5d12535ef4a
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file flagged as malicious by multiple heuristics and an ML classifier. It contains embedded links, one of which, 'https://crophysi.ru/strik?utm_term=kuta+software+infinite+algebra+1+combining+like+terms+and+distributive+property', is identified as a known malicious redirector. The PDF structure and embedded content suggest it is designed to lure users to this malicious site, likely for phishing or to download further malicious 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
  • 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/strik?utm_term=kuta+software+infinite+algebra+1+combining+like+terms+and+distributive+property In PDF document text
    • http://youtube-subscribes.com/wahl_clippers_parts_list9ttuy.pdfIn PDF document text
    • http://itabody.space/bendy_in_nightmare_run_mod_apk_revdldr25v.pdfIn PDF document text
    • http://sukalolijijegiz.iblogger.org/saxovetip.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/917efe28-f4c1-4fee-bb60-6392875570b9/1659485352.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb5cf5a3-de79-4094-8b6d-ceca0291de8e/ropobetozug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14da5bf5-1e2c-403a-8286-3a4e23657008/how_to_access_my_cisco_dpc3825.pdfIn PDF document text
    • http://joxowosikaze.rf.gd/36529679890.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/sanabuxesetalojosinima.pdfIn PDF document text
    • https://s3.amazonaws.com/gitipelut/grace_reformed_baptist_church_houston.pdfIn PDF document text
    • https://s3.amazonaws.com/kavifunaruvi/manuale_termostato_bticino_l4451.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/balfour_v_balfour_1919.pdfIn PDF document text
    • http://pizoxuwa.epizy.com/consumer_digest_car_buying_guide.pdfIn PDF document text
    • http://tazigedefabe.rf.gd/wuvegajekutiwifa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77d52b8a-594f-4885-a00d-9989363df3cd/4636398130.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b1a1172-998e-4cb5-b576-8c047afa277d/15335549719.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/559eda44-6761-40d7-a792-5eb1c9990e9e/let_the_right_one_in_remake_rotten_tomatoes.pdfIn PDF document text
    • http://wupewujivijulo.epizy.com/71802868352.pdfIn PDF document text
    • https://s3.amazonaws.com/kiremefegonar/91290100344.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5dd4cc5-8bd5-40d4-b80b-15170fec8901/xozibazabagegoxevudox.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_off0000cb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB2A 5956 bytes
SHA-256: a691879ded8ca0df78938e40b4bfaafa49466da99102a917a8eb7518980e4844
font_01_sfnt_off0000df82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF82 9832 bytes
SHA-256: a551b0dfd1e86b42eadc64255e7fb47fa7af924cb51398b95665a240073e4d4f

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