Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd768e55fcb24a2d…

MALICIOUS

PDF

72.9 KB Created: 2021-02-16 06:00:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: db43a65377ea223065275a2e0fe6fdef SHA-1: 7957e2c2c06135cf76d07aa0f0a143b0cad0d0c8 SHA-256: dd768e55fcb24a2dbd92e807656a364ac21b9bf3f2fbed1dcd3e5f5da4f964fc
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains a large number of external links pointing to disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs are consistent with techniques used to exploit vulnerabilities or deliver malicious payloads.

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://maypoin.ru/strik?utm_term=can+law+enforcement+retrieve+snapchats PDF link annotation
    • https://fezivalolir.weebly.com/uploads/1/3/4/4/134461714/figudufoveb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419626/normal_5fcf747be0ae5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368238/normal_5fe2b92d5c79c.pdfIn PDF document text
    • http://websecurer.tech/30974904780brbmo.pdfIn PDF document text
    • https://cdn.sqhk.co/sepokafaru/aLgiha6/beruv.pdfIn PDF document text
    • https://legadiduzavof.weebly.com/uploads/1/3/2/6/132681829/vigigogasiwixe_nerabij_bolivivaji.pdfIn PDF document text
    • http://fegudifo.22web.org/84281152410.pdfIn PDF document text
    • http://rabota-plus.club/47659187792o7srz.pdfIn PDF document text
    • https://fadatofi.weebly.com/uploads/1/3/1/3/131381363/panogododuj-sikojewak-paxisutik-bosaso.pdfIn PDF document text
    • https://lujipened.weebly.com/uploads/1/3/2/7/132740552/230d0d.pdfIn PDF document text
    • http://greyfruit.space/volume_booster_sound_booster_music_eqpcwlu.pdfIn PDF document text
    • https://wanomumopanud.weebly.com/uploads/1/3/1/3/131379193/mobetoz.pdfIn PDF document text
    • https://geziduvugizi.weebly.com/uploads/1/3/4/8/134862990/2910272.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dimizisunope.epizy.com/gotojuxi.pdfIn PDF document text
    • http://nenunosulijud.rf.gd/536137961.pdfIn PDF document text
    • http://watosoxugulufi.epizy.com/45872599184.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_off0000e021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE021 5312 bytes
SHA-256: 3f7fea3432665fea0a0271ac6aa01a13edc00d01ef86a252201c494c1c50b0c1
font_01_sfnt_off0000f221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF221 10580 bytes
SHA-256: 306410a3166dc5610737a14141a15957878f962e4a44aea3b4feb54227a392df

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