PDF malware analysis — malicious · ae5bdf02e92a66e8

MALICIOUS

PDF

126.2 KB Created: 2021-03-17 06:49:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20

MD5: f70b1e93d69ae4106dd3f644a807d06e SHA-1: b21bef1944286cb790fd35548d0e4a3a6e8d3d31 SHA-256: ae5bdf02e92a66e86686fd170c51286aee14c33ecda6a6d954e073531df13614

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, including one pointing to 'zajinet.ru' which appears to be part of a link farm designed to redirect users. Another URL, 'nojosomefoviw.66ghz.com', is hosted on disposable infrastructure, suggesting it's used for malicious distribution. The presence of these URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest a phishing or malware delivery attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9995

Heuristics 5

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 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://zajinet.ru/123?utm_term=ntpc+dadri+summer+training+report+ppt PDF link annotation
- http://nojosomefoviw.66ghz.com/68565731466.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4408881/normal_60387fe888d0a.pdfIn PDF document text
- http://vedice.ru/computational_fluid_dynamics_nptelukf5j.pdfIn PDF document text
- http://proflist-kursk.ru/all_plants_startupw52f8.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4501654/normal_6045eea1109a2.pdfIn PDF document text
- http://dhl-order.info/bergeys_manual_of_bacteriologyer9ti.pdfIn PDF document text
- http://giwewewobarijis.22web.org/social_learning_theory_by_albert_bandura_ppt.pdfIn PDF document text
- http://loduwij.scienceontheweb.net/54746274149.pdfIn PDF document text
- http://rajukilodagoje.mygamesonline.org/ib_history_guide_2021.pdfIn PDF document text
- http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://s3.amazonaws.com/dogazisuze/naporusifimavi.pdfIn PDF document text
- https://s3.amazonaws.com/wemupajese/docker_swarm_command_cheat_sheet.pdfIn PDF document text
- https://11fe2947-f393-4df3-905d-f9f3730e834a.filesusr.com/ugd/b1b16e_4f57179ba0294362ae8c275c0b9311df.pdf?index=trueIn PDF document text
- http://pevipitoz.atwebpages.com/realflight_7.5_dongle_emu.pdfIn PDF document text
- http://rusakarazixano.epizy.com/70269955349.pdfIn PDF document text
- https://8c285b57-3156-47ce-881b-df665acc117b.filesusr.com/ugd/8d46c2_b42ed82bd16345cf9191407e85b41496.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/rodakarugupoko/pujokimizoresuxoxuke.pdfIn PDF document text
- https://09d56968-2ae9-412d-ad86-e67dc63a1c23.filesusr.com/ugd/e8b91f_643aeb69c6834a4aac31ec2b80c79b57.pdf?index=trueIn PDF document text
- https://780c8f77-0f51-49ab-8dd1-60a90eb210a4.filesusr.com/ugd/1b8612_e657eb799b444c36ac03cecb59efb0dc.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
- 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_off00018f5b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x18F5B	1644 bytes
SHA-256: `9372114fc2afbbd1306adf3775b76b2cf5b8ef0f12f20037ef8eba88f8b5f48a`
`font_01_sfnt_off00019786.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x19786	5332 bytes
SHA-256: `96ceeeef8b1f35c24d8aa6b296a28cac50736e85f25a870ad69fb0700eccbf02`
`font_02_sfnt_off0001a992.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1A992	12836 bytes
SHA-256: `970a62f84f48ea52fca10d3d6004ca124014db74686473877a53150895731135`
`font_03_sfnt_off0001d579.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1D579	16164 bytes
SHA-256: `6e3fbd491d8b71441998836ddca0d0c102716a221ea14f8143929167ad9a79b3`

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