PDF malware analysis — malicious · f2914f32f82026b9

MALICIOUS

PDF

77.1 KB Created: 2021-02-22 18:42:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03

MD5: 5c6ba52842387540ff0f839996cd90c0 SHA-1: dda44f71e7f29a66954cfaf1af3b78eb3f22a211 SHA-256: f2914f32f82026b9f4a6013b9329510f3f52f8ea6c0a2391e488fa1afc307c8e

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links pointing to disposable hosting services, suggesting a link farm or SEO manipulation tactic. The embedded URLs, such as 'https://jacksth.ru/strik?utm_term=usmle+first+aid+2020+online', are likely used to redirect users to malicious sites or to distribute further payloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/strik?utm_term=usmle+first+aid+2020+online PDF link annotation
- https://toroborelap.weebly.com/uploads/1/3/4/8/134867907/kexozunefatisew.pdfIn PDF document text
- http://usacreditreport.info/19768600807cua5.pdfIn PDF document text
- https://tozadifoxu.weebly.com/uploads/1/3/4/9/134904498/kepadi-livax.pdfIn PDF document text
- https://zemedabumudog.weebly.com/uploads/1/3/2/7/132712209/takitasisasozeboli.pdfIn PDF document text
- https://pexerewiku.weebly.com/uploads/1/3/5/3/135313352/4996319.pdfIn PDF document text
- https://cdn.sqhk.co/miwavilusaji/jahePbF/ranuzawub.pdfIn PDF document text
- https://cdn.sqhk.co/xuwadezab/JzA2jgC/kiku_menu_paramus.pdfIn PDF document text
- http://prizinsta365.site/myers_briggs_personality_breakdownlk7xb.pdfIn PDF document text
- http://coupons2020.info/free_to_air_tv_guide_sydney_tonightz8ki0.pdfIn PDF document text
- https://ribavazo.weebly.com/uploads/1/3/5/3/135322422/7192009.pdfIn PDF document text
- https://nunodovov.weebly.com/uploads/1/3/1/3/131380210/jefep.pdfIn PDF document text
- https://vefonero.weebly.com/uploads/1/3/1/0/131070196/206662bf.pdfIn PDF document text
- https://lenexemumuvag.weebly.com/uploads/1/3/1/4/131438583/rimofukanob.pdfIn PDF document text
- https://zawasofolebu.weebly.com/uploads/1/3/4/9/134902788/wiwaro.pdfIn PDF document text
- https://cdn.sqhk.co/foroboreb/hhgjgTW/78329107593.pdfIn PDF document text
- https://cdn.sqhk.co/jujejorule/ifhjLjh/car_parking_multiplayer_apk_mod_latest_version.pdfIn PDF document text
- http://reactivaperu-viabcpi.com/shiva_ashtakam_telugux3v6x.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/pajeriramal/gold_bangles_designs_catalogue.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_off0000e122.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE122	5104 bytes
SHA-256: `2efccda58fb7e0d234347785c5628bfcf870a7dcb5cd4a44365c56e2da5fcc52`
`font_01_sfnt_off0000f25a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF25A	10900 bytes
SHA-256: `6828e11872c32266bc9b5bed33f1f6e2a4dda6f21ed856837a72ae4599e53614`
`font_02_sfnt_off0001177b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1177B	4324 bytes
SHA-256: `ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230`

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