PDF malware analysis — malicious · b2aeaa48d6d5a3f1

MALICIOUS

PDF

80.9 KB Created: 2021-09-17 07:03:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: bb47da271219dde4863d3c6e685cf87b SHA-1: 341517f84fadd0df67127ed2fce76e89627c723f SHA-256: b2aeaa48d6d5a3f162db0afc3a6c0e53b53332c1d8a9cc1ee68f6eb5d82fa96e

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains embedded JavaScript and numerous external links, many pointing to disposable domains, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a tactic to obscure malicious intent through a large number of low-reputation links.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://dungcumaymoc.com/Images_upload/files/3220313367.pdf In PDF document text
- http://pastadimatteo.com/ckfinder/userfiles/files/94674275398.pdfIn PDF document text
- https://araprinter.com/ckfinder/userfiles/files/vadaroluxisikerorugodipuw.pdfIn PDF document text
- https://ceccarmaramures.ro/userfiles/file/65307157797.pdfIn PDF document text
- http://yilbasipromosyonu.com/userfiles/file/83603884810.pdfIn PDF document text
- http://sswjeans.com/files/purodadaren.pdfIn PDF document text
- http://santehnika34.ru/images/file/soxufa.pdfIn PDF document text
- https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/43721192847.pdfIn PDF document text
- https://jungleflightchiangmai.com/Uploads/files/3692565071.pdfIn PDF document text
- http://northmarking.com/userfiles/files/25159636289.pdfIn PDF document text
- https://studiecarriere.it/uploads/file/luwunepunabafivojatemukul.pdfIn PDF document text
- http://cross-winds.in/upload/contents/images/images/nuxikezujijum.pdfIn PDF document text
- http://dayou.tw/uploadpic/files/202109161604437862.pdfIn PDF document text
- http://toszegisuli.hu/userfiles/file/72257250713.pdfIn PDF document text
- http://architettoannalisatinelli.it/userfiles/files/66486224108.pdfIn PDF document text
- http://piotrkowska77.pl/zdjeciafile/rewuzejizeb.pdfIn PDF document text
- http://p-itos.net/admin/userfile/image/file/nowivumurawubilukev.pdfIn PDF document text
- https://powerliteaac.com/userfiles/file/56258157761.pdfIn PDF document text
- http://grandrosso.com/js/upload/files/80646114536.pdfIn PDF document text
- https://fibra-optica.ro/ckfinder/userfiles/files/53895115378.pdfIn PDF document text
- https://gulf-rope.com/images/bulk_images/files/6717181809.pdfIn PDF document text
- http://www.jobsincrete.gr/images/_user_na/file/12103335969.pdfIn PDF document text
- http://xn--80aikni6a0b.xn--p1ai/images/file/41176391769.pdfIn PDF document text
- https://lideregitimpaketleri.com/calisma2/files/uploads/30836202655.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=slow+motion+video+fx+modPDF 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_off0000d565.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD565	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ed77.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED77	18500 bytes
SHA-256: `7665db91a1d80b8e16a458a236d76d5094c77138ce22653adaa9fc41a396a123`
`font_02_sfnt_off00011e34.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11E34	10412 bytes
SHA-256: `254a40ada98396c3b6d4446c907cb4af1709b5eac0b58081fba95663f5cab65e`

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