PDF malware analysis — malicious · 4121721e984bb7e5

MALICIOUS

PDF

86.9 KB Created: 2021-02-23 10:47:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31

MD5: f36d1392846eb849c36d59f0a580372c SHA-1: 107d754f90d6feb0d77fb99d7b97d5e45efc8baa SHA-256: 4121721e984bb7e534020557cee28ee96fa98002fff67effd749132aa79eea73

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm with numerous external links, many hosted on disposable domains, suggesting a malicious intent to redirect users. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with phishing or malware distribution, likely leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

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.
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://druttle.ru/123?utm_term=how+to+connect+hp+deskjet+2541+printer+to+wifi PDF link annotation
- http://fexuvukenix.22web.org/newspaper_bill_format_in_excel.pdfIn PDF document text
- https://livugazenexaru.weebly.com/uploads/1/3/1/6/131607095/ef66d6ee8d1d3d5.pdfIn PDF document text
- https://cdn.sqhk.co/dasekizob/ddNMjjj/out_there_chronicles_ep_1_guide.pdfIn PDF document text
- https://cdn.sqhk.co/sobupepokor/ijcjggj/escape_plan_4.pdfIn PDF document text
- https://cdn.sqhk.co/wotirixa/eQjgmIW/kick_the_buddy_unblocked_games_for_school.pdfIn PDF document text
- https://ditomivowulute.weebly.com/uploads/1/3/4/6/134679561/vipuranapujazabesipa.pdfIn PDF document text
- https://cdn.sqhk.co/zavipudajose/tgcibje/10495793435.pdfIn PDF document text
- http://bitipusefotas.66ghz.com/fond_du_lac_commonwealth_reporter_archives.pdfIn PDF document text
- https://katudiwuf.weebly.com/uploads/1/3/6/0/136006549/turafewe.pdfIn PDF document text
- https://cdn.sqhk.co/rowubuvuke/fjaziib/63771932263.pdfIn PDF document text
- https://xexemisekugo.weebly.com/uploads/1/3/4/6/134679242/tusiwemozobo-dokizepapevewe-giseloz-nogoparusegu.pdfIn PDF document text
- http://xitnet.fun/what_are_the_18_prophetic_books_of_the_biblepvshq.pdfIn PDF document text
- https://tizitumobupo.weebly.com/uploads/1/3/4/9/134904485/7838741.pdfIn PDF document text
- https://cdn.sqhk.co/tipefima/hjhj2mD/nova_launcher_prime_apk_2020_uptodown.pdfIn PDF document text
- http://wide-mean.top/blank_map_of_ancient_greece1yd1j.pdfIn PDF document text
- http://shortsomfj.space/31003664224chl7w.pdfIn PDF document text
- http://kpupnov.pro/sexcraft_mod_minecraft_1._7_10tbgyy.pdfIn PDF document text
- https://cdn.sqhk.co/waximanodif/hjylih5/crossword_heaven_clue_help.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
- http://nujexaraxeb.epizy.com/zesaragunolulix.pdfIn PDF document text
- http://verejixufitoge.rf.gd/60556469476.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_off000108d2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x108D2	5380 bytes
SHA-256: `bd67ff7292f99b2353bed4a9b410ae82612837aa43fe9c916c3518691f2ed6bb`
`font_01_sfnt_off00011b38.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11B38	10672 bytes
SHA-256: `b8f7e208215c16319d5b4d38df88ad14f77fa9c1696c30195abf52bc12ce7a72`
`font_02_sfnt_off00013f9d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13F9D	4324 bytes
SHA-256: `ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3`

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