PDF malware analysis — malicious · 811989ea9cf14b87

MALICIOUS

PDF

81.7 KB Created: 2021-05-03 23:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20

MD5: 57546d23ec800fab70c37127888dc9b3 SHA-1: 21646c503819d51a02e80afb3832743853f6c0eb SHA-256: 811989ea9cf14b87da7ddc328d56c8a962d749bc0f06e85d7e010d58662c46b6

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous external URLs pointing to other PDF documents hosted on disposable domains. The primary purpose appears to be SEO manipulation or distributing further malicious content, as suggested by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/strik?utm_term=what+will+the+new+moon+bring+2020 PDF link annotation
- http://tehnotop.space/spoon_river_anthology_italiano97u4a.pdfIn PDF document text
- https://cdn.sqhk.co/vinasujitupe/aghehaG/evo_popcorn_price.pdfIn PDF document text
- https://cdn.sqhk.co/posukomokufi/dBifiea/words_in_a_pic_2490.pdfIn PDF document text
- http://sportita.fun/konica_minolta_bizhub_c258_driver_macn0xu1.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4367940/normal_5fd24fafd6565.pdfIn PDF document text
- https://divulonuwuw.weebly.com/uploads/1/3/1/4/131482828/3854093.pdfIn PDF document text
- https://rogapunuki.weebly.com/uploads/1/3/4/3/134375427/5679651.pdfIn PDF document text
- https://tivepikilusu.weebly.com/uploads/1/3/4/7/134759048/pazawifutikobizinedi.pdfIn PDF document text
- http://autobuff.xyz/dishwasher_repair_near_me_cheapmaz4p.pdfIn PDF document text
- http://mybiol.site/types_of_human_errors_in_aviationg0pdk.pdfIn PDF document text
- http://shopmzm.site/v_shred_metabolic_confusion_reviewsy0m6r.pdfIn PDF document text
- http://eurofamily.pro/aamc_mcat_practice_test_3_answer_keyhygez.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4408875/normal_6049772c5584d.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4443354/normal_60076faf0befe.pdfIn PDF document text
- http://lighttravel-ng.com/68664512073d9mxm.pdfIn PDF document text
- https://xibulifi.weebly.com/uploads/1/3/4/5/134509251/6950684.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://1618b3f4-dcc0-4047-a816-eeb1cbe43c51.filesusr.com/ugd/a01749_3c4769bb4c4846ba89b3d57f3c371c36.pdf?index=trueIn PDF document text
- https://5a98ae10-8c7e-48da-b83f-9bcbc644cfa3.filesusr.com/ugd/9a8764_499188cca00842598989bf806f8fc8b4.pdf?index=trueIn PDF document text
- https://83372c7a-1065-4b07-8284-b64562b46e84.filesusr.com/ugd/035489_a4cbd12864974c0a86d37bc5fa77518b.pdf?index=trueIn PDF document text
- https://9e1e9198-0fe7-4103-8084-fdcc6befb8d5.filesusr.com/ugd/2f7815_d4530d3e3eb5409da08851f85bef5189.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f34a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF34A	5228 bytes
SHA-256: `edac34a3ea082c56703c1941f91a6254423b39857efc75a20f7eed432d9b7c26`
`font_01_sfnt_off000104f4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x104F4	11172 bytes
SHA-256: `2922824d217b854bd6696ed46c130b21c95b6aa5a0ffcc543f049e32adb099a6`
`font_02_sfnt_off00012ae7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12AE7	4324 bytes
SHA-256: `05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176`

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