Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf3bdb27e8f53869…

MALICIOUS

PDF

77.0 KB Created: 2021-04-23 02:58:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 97b12c42f4b2ee07ee6ddaae20389b9b SHA-1: 77389e6364a45584a20eb53f35ccf4e89b5b94d3 SHA-256: cf3bdb27e8f53869425985246212bc2a1944718bc6daa35680fb183bc772326c
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO spam operation. The presence of a URL with a 'utm_term' parameter suggests a phishing or marketing lure. ClamAV and ML classifiers also flagged this PDF as malicious, likely due to its structure and embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://jacksth.ru/strik?utm_term=how+to+buy+pre+market+webull PDF link annotation
    • https://xegezegev.weebly.com/uploads/1/3/2/6/132683484/gagavogudun.pdfIn PDF document text
    • https://kunepupavebi.weebly.com/uploads/1/3/4/0/134095879/numikafalomor.pdfIn PDF document text
    • http://hihikane.space/81418606199x6fcm.pdfIn PDF document text
    • https://bevazemirif.weebly.com/uploads/1/3/4/8/134873662/bapitisubilisi_zilemanos_xelitesuzap_banumovup.pdfIn PDF document text
    • http://profyhouse.ru/5054445066k819q.pdfIn PDF document text
    • https://xutonipojoneri.weebly.com/uploads/1/3/4/6/134667901/dukuwilu.pdfIn PDF document text
    • https://mopebewugo.weebly.com/uploads/1/3/0/7/130776026/2814104.pdfIn PDF document text
    • http://qqkaxes.xyz/psicologia_de_la_memoria1ptzq.pdfIn PDF document text
    • https://kizutete.weebly.com/uploads/1/3/4/0/134000266/1075776.pdfIn PDF document text
    • http://luvetikemo.66ghz.com/kebixa.pdfIn PDF document text
    • https://bigififipajug.weebly.com/uploads/1/3/4/7/134709095/d86d68019.pdfIn PDF document text
    • http://mazers.fun/what_does_48_000_grain_water_softener_meanlp339.pdfIn PDF document text
    • http://osmosiotzs.fun/hungry_shark_evolution_dinheiro_infinito_apkw0wwv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://67a4337f-2b79-4d04-9c1d-2578c80f4945.filesusr.com/ugd/964009_cccd3f25a0264884a8afc17accc6b91d.pdf?index=trueIn PDF document text
    • https://667b589a-70dd-4c78-a03f-47f6e9f07b1f.filesusr.com/ugd/db80c5_7990fd08d82d4b80baab01c640238ad2.pdf?index=trueIn PDF document text
    • http://nifekubipaxo.epizy.com/65589898938.pdfIn PDF document text
    • http://pabudixobo.epizy.com/bible_study_lessons.pdfIn PDF document text
    • https://6f0a1f77-3195-4c90-aae7-8e5805bb56bd.filesusr.com/ugd/f94fd0_9a9ef011043d49edb4c3514aefa7e33a.pdf?index=trueIn 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_off0000eee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE2 5144 bytes
SHA-256: 96a6cdf6b4395888d426e72efff7eb5d4353c2572c748c9a77a26af650ac2a1d
font_01_sfnt_off0001005e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005E 11468 bytes
SHA-256: 0a38f4cdfaa094b1f313dc2138e6a13e6c30e7ae0cd8fcc7d2a4d054bcb72ea7

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