PDF malware analysis — malicious · 38cdca30e45e9fb4

MALICIOUS

PDF

97.7 KB Created: 2021-09-13 22:54:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: e1bdb608c5f361e92613739670ac0480 SHA-1: b2d3a9561e332e063b9461149ce52110e2470156 SHA-256: 38cdca30e45e9fb4eb4821027149b8b3c183f7a4bd538a0988b2c5d30661084b

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, with a critical detection score. It contains an embedded JavaScript stream and a large number of external URIs, many of which point to potentially disposable hosting. This indicates the PDF is likely a lure to redirect users to malicious sites or download further stages of malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9928

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 http://lunaleo.pl/userfiles/file/54377713936.pdf In PDF document text
- http://sipsak.nl/userfiles/file/6691557792.pdfIn PDF document text
- https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613badd46cab1---96686726154.pdfIn PDF document text
- https://retta-bg.com/userfiles/jinidasafufujerajalebufof.pdfIn PDF document text
- http://emons-verlag.net/testarea/cwsCMSlight/media/files/68674878444.pdfIn PDF document text
- https://albertoangel.sinecsas.com/ckfinder/userfiles/files/56824709649.pdfIn PDF document text
- https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613480b447400---zelenamifilaba.pdfIn PDF document text
- http://oldmotorsclub.com/files/file/zipovolaxozajunidugabeset.pdfIn PDF document text
- http://jewelry-shopping-city.com/uploads/files/202109100345594915.pdfIn PDF document text
- http://grasslandtj.com/upload/files/tesuxaworaxegezaduvij.pdfIn PDF document text
- http://signauction.net/userfiles/file/14052654809.pdfIn PDF document text
- https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/19654687655.pdfIn PDF document text
- https://ap-qatar.com/userfiles/files/46130180999.pdfIn PDF document text
- http://cukorbetegshop.hu/files/gazuravi.pdfIn PDF document text
- http://bugaboo-buffalo.eu/UserFiles/File/14199760700.pdfIn PDF document text
- http://redactron.com/userfiles/file/fevorofakabipunor.pdfIn PDF document text
- https://trungtammatnamviet.vn/upload/files/pifirofilebezor.pdfIn PDF document text
- http://garankuccu.com/upload/fckimagesfile/d557a37e9bfbbf41f56a718e0bade303.pdfIn PDF document text
- http://saimiri.name/upload/file/144219201.pdfIn PDF document text
- https://alharithiforcameras.com/ckfinder/userfiles/files/98774985178.pdfIn PDF document text
- http://applexin.com/ttpsea/files/file/zapanepivuwizola.pdfIn PDF document text
- http://northmarking.com/userfiles/files/94842519254.pdfIn PDF document text
- https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/kevuzimipoxu.pdfIn PDF document text
- http://mayinluatudong.com/uploads/userfiles/file/tazosizadugimoboraxakis.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=the+legend+of+korra+kisscartoonPDF link annotation
- 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_off000119fe.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x119FE	10812 bytes
SHA-256: `74dad7ce8fd1adfb2bb0d89c5af70a77920097cdbb7dc8eb698816803f9683f2`
`font_01_sfnt_off000132a9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x132A9	17604 bytes
SHA-256: `148a83ebc480036501e544a96db496252444c6761c091d8ec4fc0d706a03103a`
`font_02_sfnt_off00015fbc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15FBC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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