PDF malware analysis — malicious · 6950c1f44736deae

MALICIOUS

PDF

90.3 KB Created: 2021-10-07 17:29:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31

MD5: acb105835a5ceefc6b19f405b8231c05 SHA-1: 91c78ef74c09b44688cd89a153ce411abf47a0c6 SHA-256: 6950c1f44736deaed8dbdd41e6f7991183e26fd02576354ac55f25a8bc36e6c0

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically identified as part of a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards an attack pattern involving user redirection.

Machine Learning

Nyx PDF Classifier malicious score 0.9956

Heuristics 5

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.
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://cructi.ru/uplcv?utm_term=previous+year+paper+of+afcat PDF link annotation
- http://dijladentalcenter-qa.com/userfiles/file/jagimewari.pdfIn PDF document text
- http://www.itidharamshala.in/images/uploads/files/tagifadibezizubibatipek.pdfIn PDF document text
- http://sklenicky-obchod.cz/web/admin/fckeditor/userfiles/file/visepefefabiru.pdfIn PDF document text
- http://chongros.com/userData/board/file/76128548590.pdfIn PDF document text
- https://stvorki.ru/files/file/jawosagaf.pdfIn PDF document text
- https://tradingphrases.net/userfiles/files/wekogakajigunuzugitufug.pdfIn PDF document text
- https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/k6b25ck596oisdpje34mvrddv4/fixabemorekame.pdfIn PDF document text
- https://ubranni.com/uploader/files/rugefagef.pdfIn PDF document text
- http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301796b4ef4---83323941260.pdfIn PDF document text
- http://klasykarozrywki.pl/public/images/fck/file/8708981942.pdfIn PDF document text
- https://arnetbilgisayar.com/upload/ckfinder/files/belemirezerulunebo.pdfIn PDF document text
- https://martas.vodrsport.cz/uploads/files/73737623265.pdfIn PDF document text
- https://culturasiapamplona.com/guiarte_userfiles/files/vuzajijuzojunipibejuxido.pdfIn PDF document text
- http://quaint-house.com/images/blog/file/70484383122.pdfIn PDF document text
- http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/zupubajezelepevudigujeku.pdfIn PDF document text
- http://nemochem.cn/upload/files/47744486605.pdfIn PDF document text
- https://alhasooncorp.com/Files/files/15346590465.pdfIn PDF document text
- http://favourtec.com/attachment/file/8533797804.pdfIn PDF document text
- https://onlineadda.organicemall.com/ckfinder/userfiles/files/zuxawatewajonojugola.pdfIn PDF document text
- https://tapuionoticias.com/ckfinder/files/dopurejajixaf.pdfIn PDF document text
- http://fohow77.ru/upload/file/funokiwamejaroxelilewoxol.pdfIn PDF document text
- http://capitaldanceacademy.com/userfiles/files/zokonokika.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_off0000f8fd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF8FD	19508 bytes
SHA-256: `38b883a9e75bb650c968b80054711f39f1a136d8bb7e84df4ca555a45b89359f`
`font_01_sfnt_off00012b38.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12B38	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001434f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1434F	10604 bytes
SHA-256: `334756c863628b2883a3f6e8457be48e77a0c1fc0c30604aba632523b6bc6e2d`

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