PDF malware analysis — malicious · 843384ec21eb750b

MALICIOUS

PDF

80.5 KB Created: 2021-03-24 10:24:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21

MD5: 691c3fe870ef2e714ec50009054a3e75 SHA-1: 26268a24d2ebb34e93b234fdfa37e9c7ca6f4130 SHA-256: 843384ec21eb750b87c73fbfdc6c17d02c0594e1b70d6889f314420bd25b9d57

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with a primary suspicious URL pointing to a domain associated with a link farm and potentially malicious content. The document body, though heavily obfuscated, suggests a lure related to aircraft maintenance costs, likely to entice users to click the malicious link.

Machine Learning

Nyx PDF Classifier malicious score 0.9995

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://xezojetit.ru/strik?utm_term=how+much+to+maintain+a+cessna+172 PDF link annotation
- https://static.s123-cdn-static.com/uploads/4463533/normal_5fccfedd0fc08.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4462056/normal_602a0f7bd86d2.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4465012/normal_603dcfe53bdfd.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4387581/normal_5fe2d3da6707e.pdfIn PDF document text
- http://xegazinijitup.mywebcommunity.org/28694372557.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4466659/normal_600d5a61d2ab6.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4494677/normal_60325fc73d877.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4456687/normal_60490deca03b6.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4391899/normal_5fd28a431f88c.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4475985/normal_6016df43d6180.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4485015/normal_5fec16c591de9.pdfIn PDF document text
- http://nomevufaneboja.mypressonline.com/nawutukexap.pdfIn PDF document text
- http://kevifiregerufug.scienceontheweb.net/blockchain_technology_explained_the_ultimate_beginner_s_guide.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/rurovikejigibu/zetuvefikawotefigigi.pdfIn PDF document text
- https://s3.amazonaws.com/kevava/41931050261.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/7248857a-3a0e-4cd9-aebc-3c66bb470170/17042734051.pdfIn PDF document text
- https://s3.amazonaws.com/setigafat/overlord_light_novel_vol_15_vietsub.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/f88a912c-1379-4220-a6c0-fe69f6e269d4/understand_theories_of_management_and_leadership_and_their_application_to_health_and_social_care.pdfIn PDF document text
- https://s3.amazonaws.com/tonemakopinibem/61728314467.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/605e6b51-13ef-4bba-9c01-a20d17d61b0d/what_role_did_america_play_in_world_war_2.pdfIn PDF document text
- https://s3.amazonaws.com/vonuxagupeduze/sifubaxinotiwakekoloz.pdfIn PDF document text
- http://pedirite.onlinewebshop.net/84551079133.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_off0000ef63.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF63	5112 bytes
SHA-256: `4736fec23d0f9f0322806544691865e9e9ef12748cc0adc69701aad82af13b4c`
`font_01_sfnt_off000100c0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x100C0	10984 bytes
SHA-256: `990ab283e17c78bb050053a62a2e05f4b68a50205dd38e06e522505f1c0cfa12`
`font_02_sfnt_off0001264e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1264E	4324 bytes
SHA-256: `0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333`

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