PDF malware analysis — malicious · 36ad441210d8d742

MALICIOUS

PDF

79.3 KB Created: 2021-05-23 05:03:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24

MD5: 09069173758a9d6f222d32ad3f1d515e SHA-1: efdac354af830fb0e48bfb26efd5aad96d490c62 SHA-256: 36ad441210d8d742645354fe67896044242fab86a350327a63dee1b4db8febe7

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, a common tactic for SEO spam and phishing. One prominent URL, 'https://pelibifir.ru/strik?utm_term=minecraft+download+free+download+2021', suggests a lure related to downloading Minecraft, a popular game. The PDF also contains a large number of embedded links, with one pointing to 'https://s3.amazonaws.com/tazopaju/bigiviripepefememutopikig.pdf', indicating a potential link farm or distribution point for further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

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 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.
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://pelibifir.ru/strik?utm_term=minecraft+download+free+download+2021 PDF link annotation
- https://zefinefan.weebly.com/uploads/1/3/2/8/132816158/0c5cd790b.pdfIn PDF document text
- https://buzijivugaza.weebly.com/uploads/1/3/4/7/134709386/dovawofarejijot.pdfIn PDF document text
- https://norusefoxoji.weebly.com/uploads/1/3/0/7/130739223/9503754.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://s3.amazonaws.com/tazopaju/bigiviripepefememutopikig.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/d5eae15f-067b-4ffb-a0ce-53bad6ced3f8/xukevip.pdfIn PDF document text
- https://s3.amazonaws.com/xupizewuxere/jitutev.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/075cba2a-9d36-4842-8f5c-c733be5f9620/how_do_i_change_my_reebok_treadmill_from_km_to_miles.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/cb809cdd-d41f-4cea-bdae-1d08b623c098/manchester_journal_of_international_economic_law_impact_factor.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/3e46286d-8747-4a33-80a6-a7e5a39df400/pevoronudatukisegutowu.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/5a28fcc2-410a-42af-9645-b15af5baa95a/41493795056.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/49ca4921-f70e-4700-b493-b1d3a4378f1a/how_to_check_rinnai_error_codes.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/6e04cb6e-316b-4406-9d92-535831cfb232/vesogati.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/143c8c57-e7c8-4bd3-b43d-0da1915c09b0/91655283864.pdfIn PDF document text
- https://s3.amazonaws.com/xujitezu/acer_chromebook_15_cb3-532-c4zz_review.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/d3f18954-8fcb-4ac0-afd1-9a4da10376cb/persona_4_golden_guide_reddit.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/8559f6f5-09af-4499-ae22-df6826ceb126/nezopovuxuji.pdfIn PDF document text
- https://s3.amazonaws.com/nowonovege/air_formed_film.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/c2ea5d29-1f62-4529-aba0-1bf0b3349246/27307668902.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/b1d9dbb6-e33d-489b-a051-d08cc3139164/how_to_download_sound_drivers_for_windows_10.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/c8a199a0-c9e8-462f-b1e2-5d92466b163f/how_to_apply_for_exemption_from_institutional_quarantine_in_mumbai.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_off0000ed93.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED93	5048 bytes
SHA-256: `020ef2c65ec02261522c68bdf045c24ec2ac10d09bfd0a47c9396e7aac8fbb73`
`font_01_sfnt_off0000fed6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFED6	10108 bytes
SHA-256: `e57009b68184b20d25696ae45edf63910c641fa4ca5ebd949895855419b301bb`
`font_02_sfnt_off0001216a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1216A	4324 bytes
SHA-256: `1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361`

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