PDF malware analysis — malicious · c4e6844b183de28b

MALICIOUS

PDF

70.2 KB Created: 2021-09-09 06:38:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: bd485a3452af05fd2beb27fee8aac81d SHA-1: ade4cdad2cdccc6bdf901e4064bc70a2ef1e66d5 SHA-256: c4e6844b183de28bf611af95d192ce35b83cc24afec6e54b4b0b7bbd92c377fd

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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 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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://allytemp.ru/uplcv?utm_term=sonic+4+episode+1+free PDF link annotation
- https://hagakure.by/upload/editor/files/96085592295.pdfIn PDF document text
- http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/15324218119.pdfIn PDF document text
- http://ebd.su/UFD/7623/files/70221108829.pdfIn PDF document text
- https://cowichanmusicfestival.com/userfiles/file/tanofaduwama.pdfIn PDF document text
- https://evrenmentese.com/upload/ckfinder/files/vovukunumizosi.pdfIn PDF document text
- http://csc0532.com/userfiles/file/20210905130040_vbiasa.pdfIn PDF document text
- https://sunpower.lv/ckfinder/userfiles/files/95985435900.pdfIn PDF document text
- https://ecoolteh.eu/galeria/file/2523694528.pdfIn PDF document text
- http://mackyz7automotive.com/js/upload/files/17610057863.pdfIn PDF document text
- http://veterinariacasettamattei.it/userfiles/files/zubolowuwubimodu.pdfIn PDF document text
- http://emannsltd.com/userfiles/xekofajap.pdfIn PDF document text
- http://palenice.net/obrazky_clanky/file/18862424568.pdfIn PDF document text
- https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/25925819199.pdfIn PDF document text
- https://bwawarszawa.pl/upload/file/tevarazapubawesivugom.pdfIn PDF document text
- http://deborahkay.com/ckfinder/userfiles/files/25322855568.pdfIn PDF document text
- https://sreekanakananda.com/ckfinder/userfiles/files/53348278752.pdfIn PDF document text
- http://malbreil.com/userfiles/file/rafifutamibopavipi.pdfIn PDF document text
- https://www.corpeverest.com/ckfinder/userfiles/files/gagakirowibaferazurinona.pdfIn PDF document text
- http://xn----7sbndn5at.xn--p1ai/uploads/files/fogotapimevigatibis.pdfIn PDF document text
- http://marienoellebermond.com/img/uploaded/file/51832448201.pdfIn PDF document text
- https://hgb.se/filer/file/negogisibalar.pdfIn PDF document text
- https://dijitalsanat.link/upload/files/72861188380.pdfIn PDF document text
- http://www.elstar.ru/uploads/files/kusovuwapawijisuv.pdfIn PDF document text
- https://lanna-flyingclub.com/ckfinder/userfiles/files/94549200511.pdfIn PDF document text
- http://mbjarrahi.com/UploadedFiles/New/file/71870758704.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://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000b410.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB410	10512 bytes
SHA-256: `c9dfc4c3dfbf177d7e7200d89f3f6cab62600b23b345e0d969c6bb1b4d5aaaab`
`font_01_sfnt_off0000cc1a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCC1A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000e42c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE42C	15332 bytes
SHA-256: `d01df25f63e4970c5e9308552fdbcafc21c2a4fcb7bcf438bd8803baf7ac6eb8`

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