PDF malware analysis — malicious · 4a2d3efa97078f87

MALICIOUS

PDF

80.6 KB Created: 2021-05-18 19:21:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20

MD5: 4125e59327fd322431fef8cc651124b5 SHA-1: c2ab330263d7faf8b649f80267ecf0f22b6ca925 SHA-256: 4a2d3efa97078f87a2879f109ee83ffe2a1b4e3266e4f1668904eb5131d5aedc

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to SEO-optimized PDFs, suggesting a link farm or phishing campaign. The primary URL, 'https://resalured.ru/strik?utm_term=how+to+put+water+beads+in+a+balloon', is identified as a redirector for free-download phishing. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 6

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.
Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK

PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
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://resalured.ru/strik?utm_term=how+to+put+water+beads+in+a+balloon PDF link annotation
- https://rifelejoxew.weebly.com/uploads/1/3/4/3/134330737/8a95462.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4376382/normal_60696b28f1f6e.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4492875/normal_605f575f54811.pdfIn PDF document text
- https://nodejobirutita.weebly.com/uploads/1/3/4/7/134748641/suvivomaxu.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4368971/normal_60243715828f9.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4495400/normal_5fdcc7d74b324.pdfIn PDF document text
- https://tozabofosizo.weebly.com/uploads/1/3/5/3/135340530/8160317.pdfIn PDF document text
- https://pugewolusaw.weebly.com/uploads/1/3/1/4/131453132/sodopedapogadu.pdfIn PDF document text
- https://kikitepolo.weebly.com/uploads/1/3/4/5/134514310/7841646.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4483870/normal_60093fcc67e93.pdfIn PDF document text
- https://taxurazuzar.weebly.com/uploads/1/3/4/0/134042721/gulekiwagimez.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4488332/normal_5fd73a6398e71.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://s3.amazonaws.com/gelawiweza/96748727138.pdfIn PDF document text
- https://s3.amazonaws.com/mexesazaxasa/intermatic_timer_model_t101_parts.pdfIn PDF document text
- https://s3.amazonaws.com/salosibejodod/sour_cherries_nutritional_information.pdfIn PDF document text
- https://s3.amazonaws.com/fasomusogapovi/bole_chudiyan_bole_kangna_song_pagalworld.pdfIn PDF document text
- https://s3.amazonaws.com/wudibirewuduto/business_analysis_certification_courses_in_india.pdfIn PDF document text
- https://s3.amazonaws.com/zizene/9994203010.pdfIn PDF document text
- https://s3.amazonaws.com/nowonovege/ccat_test_questions.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_off0000f4e2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF4E2	5148 bytes
SHA-256: `0aa0c91a9461c7cf9183598515756388f4e8f11acbceddcd070db26d538910a4`
`font_01_sfnt_off0001066e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1066E	1800 bytes
SHA-256: `51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0`
`font_02_sfnt_off00010efc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10EFC	10860 bytes
SHA-256: `ce3db584e997492939e4f44397a9f6a4ad6f822380b9f7ec111e65d7712170e1`

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