PDF malware analysis — malicious · 2bde5261b3fd7936

MALICIOUS

PDF

82.6 KB Created: 2021-05-03 19:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20

MD5: 25882cfbd7400b48307d0de718bb5e02 SHA-1: 6bc8400f52cbcb7957711ffaff4f501a4f910705 SHA-256: 2bde5261b3fd7936ff37c5b4ee1aef3370a29f0df001cb90a2388711d7309a0c

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to disposable domains, and a heuristic identified it as a link farm designed for SEO manipulation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9992

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://golowaki.ru/strik?utm_term=rabbits+digging+holes+in+my+yard PDF link annotation
- https://cdn-cms.f-static.net/uploads/4423471/normal_605476c03a533.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4425255/normal_601f3bd6240b6.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4406787/normal_5ffab4276fa6b.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4417403/normal_6057ca0ebb1c4.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4490380/normal_5ffdc65b267f7.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4472479/normal_5fe6794020dc3.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4371523/normal_5febd7a27c471.pdfIn PDF document text
- http://mesanezedid.mypressonline.com/tipos_de_accidentes_laborales.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4481397/normal_5ffdcb031abcc.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4424662/normal_5fe4c366406f2.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://www.daltonmaag.com/In PDF document text
- https://be08d7d4-326a-4801-be9d-4496af17a43b.filesusr.com/ugd/d31907_288969be72d447fb8ed7d1e5f82d3070.pdf?index=trueIn PDF document text
- http://wemaxoseni.myartsonline.com/teacher_job_application_letter_sample.pdfIn PDF document text
- http://jetupilesoz.epizy.com/80917405320.pdfIn PDF document text
- https://s3.amazonaws.com/kozewuposoridil/seliloxixepemiwap.pdfIn PDF document text
- https://5634f520-c25d-421d-ab67-3d94505d13cb.filesusr.com/ugd/1b85ab_adb6aa3ef95d430f84a45f3d7019b7af.pdf?index=trueIn PDF document text
- http://rosukijabadizi.epizy.com/39876874951.pdfIn PDF document text
- http://nogosos.epizy.com/74050964286.pdfIn PDF document text
- https://43081b45-6e48-4b43-b724-9328fda377ae.filesusr.com/ugd/26481d_2f4ea5b7870c4283b5fad03711a281d5.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/dowadotiju/exercices_sur_le_comparatif_et_le_superlatif_en_francais.pdfIn PDF document text
- https://98cdd5c5-c43e-49eb-9373-39517e896cbb.filesusr.com/ugd/90661f_09889f22df49478dbd05ae8fbcead183.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/bejexe/nujup.pdfIn PDF document text
- https://s3.amazonaws.com/waxegatulo/91841582569.pdfIn PDF document text
- https://s3.amazonaws.com/rixevozajixezos/18009290297.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f4c9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF4C9	5276 bytes
SHA-256: `1895e2fcc33a4b276f146759af896b3fd20ca5ac5ae399351556cd5f7f8f1003`
`font_01_sfnt_off00010688.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10688	11484 bytes
SHA-256: `63909e539f903552c951da823da2f3efea38874d1aeb831b5e8f316e9091714d`
`font_02_sfnt_off00012d47.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12D47	4324 bytes
SHA-256: `1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361`

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