PDF malware analysis — malicious · 93f99e9e32d2731d

MALICIOUS

PDF

91.8 KB Created: 2021-05-23 14:35:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21

MD5: 391cd04fd40606095ccb259a26ed7f71 SHA-1: 2c139320e0e6fccaaa7e1fb809cf903c0599293f SHA-256: 93f99e9e32d2731dc471c7cd937efb1e8cb8cf6cce5cfe411eaac91dea78eaaa

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file exhibits characteristics of a link farm, with numerous external URLs embedded within its content, many pointing to disposable hosting services. The primary URL, 'https://nipisod.ru/strik?utm_term=english+speaking+course+bangla+pdf+free+download', suggests a lure for free content, likely to distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9983

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://nipisod.ru/strik?utm_term=english+speaking+course+bangla+pdf+free+download PDF link annotation
- https://static.s123-cdn-static.com/uploads/4484383/normal_5ffc398fd31a7.pdfIn PDF document text
- https://jonabosaguvaxak.weebly.com/uploads/1/3/4/8/134858844/60ddda.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4421611/normal_605157c1e0a53.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4425507/normal_5fe82cf130592.pdfIn PDF document text
- https://faliroralomi.weebly.com/uploads/1/3/0/8/130874474/0b8357ae45e71d.pdfIn PDF document text
- https://litapofigiwo.weebly.com/uploads/1/3/5/3/135349015/565249.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4380694/normal_5fdc7c23bebda.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4446045/normal_60571742dbfa8.pdfIn PDF document text
- https://puvedevedumu.weebly.com/uploads/1/3/1/4/131406841/42e6964a791.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4408195/normal_601b48edbf17e.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4485152/normal_601d89eb36987.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4498986/normal_606779b7c0743.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4445888/normal_5fe02f5ab66f2.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4374980/normal_605c96195989e.pdfIn PDF document text
- https://wedoweniwan.weebly.com/uploads/1/3/5/3/135308992/texemoko.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4484114/normal_601b72bff3893.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4409411/normal_603d89e4cc44b.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4448345/normal_5fffa5e7cf021.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4370280/normal_60026114b4da0.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4468294/normal_5fe8c39238a0e.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://s3.amazonaws.com/kexamoxusinixu/46369901603.pdfIn PDF document text
- https://s3.amazonaws.com/sazixipame/34396591611.pdfIn PDF document text
- https://s3.amazonaws.com/lulelepese/black_and_decker_hedge_trimmer_replacement_blades.pdfIn PDF document text
- https://s3.amazonaws.com/tesodagiwor/administracion_de_cadenas_de_suministro_unam.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
- https://savannah.gnu.org/projects/freefont/In PDF document text
- http://www.gnu.org/licenses/In PDF document text
- http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
- http://scripts.sil.org/OFLIn PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off000100b2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x100B2	6440 bytes
SHA-256: `629123bfde0685c5f69bbdd27ec008bde0224d5c30af1dabb990f6ee33ea778e`
`font_01_sfnt_off000110a6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x110A6	5668 bytes
SHA-256: `a5040f03c9b54857a8c45249d38616c97b4f0787d89a31e6fb858c7061aa6555`
`font_02_sfnt_off000123fe.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x123FE	12036 bytes
SHA-256: `e909a7536877f6edc40439bf37316d85a6de9f0178b63c3819905237dd79adee`
`font_03_sfnt_off00014b85.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14B85	16144 bytes
SHA-256: `18f56b7fae04e07bc119a468ad323bdda099da77b0772854d1c47cc1f39b9f3b`

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