PDF malware analysis — malicious · 6c61b9b9c8e083c1

MALICIOUS

PDF

75.7 KB Created: 2021-03-14 10:23:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20

MD5: b16744f513c106671184e0b8470ec744 SHA-1: b12383f31f90efea88ced6fd7d7f4e2b74981368 SHA-256: 6c61b9b9c8e083c1a9ff72afe9fcd0dc969588333348d04b46c32a03e51ee3d0

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ClamAV as a phishing trojan. The ML classifier also strongly indicates maliciousness. The document body, though heavily obfuscated, suggests a lure related to 'ancient history notes' to entice users to click on malicious links.

Machine Learning

Nyx PDF Classifier malicious score 0.9994

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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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/award?keyword=vajiram+and+ravi+ancient+history+notes+pdf PDF link annotation
- http://gayerkan.com/28126367072qelny.pdfIn PDF document text
- http://proba7.xyz/psychology_applied_to_teachingi5k5s.pdfIn PDF document text
- http://ruvikuvi.mywebcommunity.org/28717819469.pdfIn PDF document text
- http://nunovoxiwanafuz.getenjoyment.net/tapomojaxo.pdfIn PDF document text
- http://vsspb.ru/educational_psychology_degreewbbub.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4468294/normal_604666279553b.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4367950/normal_5fdb915dcdf04.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4470678/normal_601ce8aca2d14.pdfIn PDF document text
- http://3gusevshop.website/most_common_phrasal_verbs_in_english_exercisesy3nrg.pdfIn PDF document text
- http://dashcamtopbest.com/crochet_cardigan_patternklg1b.pdfIn PDF document text
- http://italiahot.space/whistle_song_320kbpsmdpxo.pdfIn PDF document text
- http://uchebnoe.website/download_episodes_of_kaisi_yeh_yaariyanhqtjt.pdfIn PDF document text
- http://tendernes.ru/wunexoratiritofiis49q.pdfIn PDF document text
- http://b4shop.icu/dubababitoxofemgu8g.pdfIn PDF document text
- http://selizixid.iblogger.org/24467542655.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4447631/normal_5fcb6903aa1ed.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://konazosite.epizy.com/vazisanerekazuzusokolal.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/257d8ac4-08e6-41e3-b6c8-9b9de284b36e/40290846409.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/d99c43e9-0ae1-4837-98b9-cacaffa7c66c/pifekuxe.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/c4a151ed-8233-4061-8ed8-8a88466bd857/basatudifosopi.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/41de04a3-dc0f-4a6a-b730-07aeb9784fb1/lufexuxilosinodi.pdfIn PDF document text
- http://woniladorunuf.epizy.com/76057213398.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
- 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_off0000d1db.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD1DB	5568 bytes
SHA-256: `966d5447ff40c6b7746ac21d65930b40752b43860d605ee7d5ab877171ba95f2`
`font_01_sfnt_off0000e4b9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE4B9	11296 bytes
SHA-256: `d561c51c3b63dbb0041ea6233ec61d00075ddfdc0dc48da818c0ccd2cc50cfc5`
`font_02_sfnt_off00010b60.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10B60	16164 bytes
SHA-256: `e296a61d2d303e35be9e1a35631556663d2780498efa7e8f3867bf557f172fe6`

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