PDF malware analysis — malicious · 03a9a8bd3f9eec35

MALICIOUS

PDF

84.3 KB Created: 2021-03-17 02:21:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20

MD5: 03c598a3a7aa493298a5920e092a793c SHA-1: 2039dd792b6e8312631e6f3def33176665a5372e SHA-256: 03a9a8bd3f9eec35ab83b4cb122ce1e9ca6f4d515605ee2218b492f37ed749ea

184 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded URLs, many pointing to disposable hosting, and one critical heuristic identified it as a malicious redirector link farm. The ML classifier strongly indicated maliciousness. While no scripts were extracted, the structure and embedded URLs suggest an attempt to redirect users to potentially harmful content, possibly for SEO abuse or to host further malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 5

PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK

PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
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.
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://crophysi.ru/wix?keyword=black+desert+ninja+guide+german In PDF document text
- http://faxusigeroles.sportsontheweb.net/kenuzato.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4477155/normal_5fc70e9aada2e.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4452865/normal_6005cbfa7a289.pdfIn PDF document text
- http://peluxuba.sportsontheweb.net/mathematics_std_10.pdfIn PDF document text
- http://kuzexamipapoxip.medianewsonline.com/dumajazivana.pdfIn PDF document text
- http://votixibutiro.medianewsonline.com/aikido_hand_techniques.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://kuviwobabevi.epizy.com/8291301811.pdfIn PDF document text
- http://satovimowenijor.myartsonline.com/kabusej.pdfIn PDF document text
- http://lebiwubeso.rf.gd/what_is_a_reproduction_in_art.pdfIn PDF document text
- https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_33018f2cc4734931838a4f23840d766d.pdf?index=trueIn PDF document text
- https://f414df59-d0c5-412c-8277-160bd92acc6e.filesusr.com/ugd/055bb3_77ccdb8ca7ff407395c1a59eb70ead21.pdf?index=trueIn PDF document text
- https://bf23b77b-49a9-4bef-a898-a03cfb94aefa.filesusr.com/ugd/134172_5db80bc2f4d34e83912b052752d3740c.pdf?index=trueIn PDF document text
- https://b20aee1f-b1b7-4e4e-be5e-d884e4ece670.filesusr.com/ugd/10e3af_d346f6d2bbc340c3b42f4661bb9c58a7.pdf?index=trueIn PDF document text
- https://08b4a39d-fa16-4eaa-91be-ae90003cacb9.filesusr.com/ugd/237bf7_b8c0ebe6dd0f42eaad3ceb0fd0db10c9.pdf?index=trueIn PDF document text
- https://4b3b4da4-1145-40fd-8a04-0ac29766dab0.filesusr.com/ugd/6c6203_af6be257953e477dbc1d09a94b94ebad.pdf?index=trueIn PDF document text
- https://387a498e-9551-4239-9507-3183ba214552.filesusr.com/ugd/cd403b_a9f0a4f6825048308a0f79e522fad78e.pdf?index=trueIn PDF document text
- https://0e9c393c-9feb-4465-ae9d-4486bea7a644.filesusr.com/ugd/4b68be_972b5b591d5045c6901550352217a917.pdf?index=trueIn PDF document text
- http://doninedu.epizy.com/buddha_hi_buddha_hai_video_song.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_off0000ffbb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFFBB	5448 bytes
SHA-256: `0ec4e0e7d0d955b217737acfaf023a399f1ce46d6313a0b81372c0416e79db2e`
`font_01_sfnt_off0001122f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1122F	1800 bytes
SHA-256: `a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620`
`font_02_sfnt_off00011abc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11ABC	11936 bytes
SHA-256: `b6915fdfea02dc850152064fcaccb2f6283f51c6d419949a4b2b1dd0eb5b58cd`

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