PDF malware analysis — malicious · 77fc6eb40c6d4817

MALICIOUS

PDF

73.2 KB Created: 2021-09-09 19:22:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 3c05afc9706f7acd60f3a945c01250c3 SHA-1: 68ccc98c7abc54d577005d576688c64f05d3f0c2 SHA-256: 77fc6eb40c6d4817e0f2d1fceea7793cc1a590ec8169eaf3f574a3c0576212eb

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the PDF structure point towards an attempt to redirect users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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://philabc.ru/uplcv?utm_term=vivid+filter+camera+apk PDF link annotation
- https://demetraproject.eu/ckfinder/userfiles/files/61425615610.pdfIn PDF document text
- http://jakpaisanestate.com/images/upload/files/givipelasusizefikeguri.pdfIn PDF document text
- https://thailonghoang.vn/upload/files/75673428007.pdfIn PDF document text
- http://goodlack.cz/userfiles/file/duvilisik.pdfIn PDF document text
- https://xn--fct8ml6mwue.tw/uploads/files/83846999387.pdfIn PDF document text
- http://sgpeo.pl/users/file/rizipuninuguturepazus.pdfIn PDF document text
- http://studioprogettoarchitettura.eu/userfiles/files/68580926900.pdfIn PDF document text
- http://guowangcable.com/d/files/gokipagumim.pdfIn PDF document text
- http://suspensionestg.mx/userfiles/file/91985864893.pdfIn PDF document text
- http://www.deco-interieure.com/userfiles/file/95104992835.pdfIn PDF document text
- https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130260f0ee47---46355567043.pdfIn PDF document text
- http://tichdiem.surecare.vn/uploads/userfiles/file/gizupakironokunulilis.pdfIn PDF document text
- https://aymexco.eu/ckfinder/userfiles/files/30122746892.pdfIn PDF document text
- http://bodegaadrover.com/userfiles/imagenes/27874897226.pdfIn PDF document text
- http://backupcenters.com/userfiles/file/30321457861.pdfIn PDF document text
- http://sadiqandsons.com/userfiles/files/fowalifegilogif.pdfIn PDF document text
- https://texigo.tw/upfile/files/2021/09/03/18945182831.pdfIn PDF document text
- http://studiodugnani.it/userfiles/files/vafive.pdfIn PDF document text
- http://sinoscaform.com/upload/ckimg/files/202109080505231495.pdfIn PDF document text
- https://classoft.ro/userfiles/file/60354236538.pdfIn PDF document text
- https://petribax.nl/userfiles/file/93755343219.pdfIn PDF document text
- http://paraglider24.de/pics/fotos/1/file/69366323901.pdfIn PDF document text
- https://360clothing.in/home/www360cl/public_html/uploads/images/files/62366316219.pdfIn PDF document text
- https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135bbbcbeff4---bufukawaxinozidotafub.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_off0000bbab.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBBAB	17092 bytes
SHA-256: `3aa2c660705f91d6bd2620947e0b8188c47d079bf140c28d2c40ee91d7bddc7f`
`font_01_sfnt_off0000e78e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE78E	10516 bytes
SHA-256: `4681497566b34bc2bd90df90abeccdd0226b9783b8bab1062641e8a9a876f962`
`font_02_sfnt_off0000ff82.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFF82	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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