Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f4ad42166ec70cd…

MALICIOUS

PDF

73.5 KB Created: 2021-05-11 00:21:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 70dfc981c23536b3f9e93abd38d87f7f SHA-1: d2e64e73f8e007814f714b183313fe9c86f2618a SHA-256: 9f4ad42166ec70cd5223864abe6112044d5690178c63156be0557f11c3a4dc3d
126 Risk Score

Malware Insights

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

The sample was flagged by ML and ClamAV as malicious, with heuristics indicating it's a link farm on disposable hosting. The embedded URLs, such as 'https://pelibifir.ru/strik?utm_term=po4+2-+lewis+structure', strongly suggest a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect the user to malicious content.

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
  • 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.
  • 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://pelibifir.ru/strik?utm_term=po4+2-+lewis+structure PDF link annotation
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • http://cesaregaspari.com/fomeronejedisodiperp8lg.pdfIn PDF document text
    • http://frukt.space/897185327182dxne.pdfIn PDF document text
    • http://copriyghtconfirmed.com/20563287347eqt39.pdfIn PDF document text
    • https://fofapabijutoza.weebly.com/uploads/1/3/4/7/134713913/51d09dd8de.pdfIn PDF document text
    • https://zevofukuje.weebly.com/uploads/1/3/4/5/134585027/69578.pdfIn PDF document text
    • http://rakomakefike.iblogger.org/inside_reading_2_answer_key_unit_7.pdfIn PDF document text
    • http://checkmycredit.info/dowalezubibudoxaranp6hi.pdfIn PDF document text
    • http://tendernes.ru/98011838075splam.pdfIn PDF document text
    • http://tiktokfrance.fun/lojarekemolewentscz.pdfIn PDF document text
    • https://punelita.weebly.com/uploads/1/3/4/6/134679726/bogebat.pdfIn PDF document text
    • http://forecast.bet/zuxigopimowotagow4hl.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/41637255-6a57-4099-9eb1-629a3d6a8d97/is_ryobi_any_good.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbe5b94d-cfd0-4bc2-b5dd-ceb531dbfaa4/52094562509.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/918a903b-d27c-4d01-88e8-0ec97addc7f4/95252480938.pdfIn PDF document text
    • http://vulekagezefodek.rf.gd/vetidiwidof.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_off0000e064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE064 4928 bytes
SHA-256: 7c8e898b3ead2249d215d7cc663a8e067ed20a4dd278c30943559b7220aab7a3
font_01_sfnt_off0000f163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF163 11700 bytes
SHA-256: 49ed657f524b20cc3a7616a9f2379ecd1020daa0e504773cad7d1780a0a61150

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