PDF malware analysis — malicious · 2b9e138e72a03d63

MALICIOUS

PDF

77.6 KB Created: 2021-03-13 22:32:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26

MD5: 2d888b6732a427a76a6dea1e6b3886a4 SHA-1: 4d95ca17d80680002a22b9e6fb87b29c610dca04 SHA-256: 2b9e138e72a03d63f47e9e04dc95d8749ab5ff16f0e2d4f501ff7c757fd8f896

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with a notable heuristic flagging it as a link farm on disposable hosting. The primary external URI points to a keyword-laden URL, suggesting a potential SEO manipulation or phishing lure. No scripts were extracted, but the PDF structure and external links are indicative of a phishing or malicious content distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/wix?keyword=ap+calculus+bc+sequences+and+series PDF link annotation
- http://doguzunagenuxo.22web.org/scientific_notation_operations_word_problems_worksheet.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4479904/normal_601e46b2ea999.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4380705/normal_600879a3817b1.pdfIn PDF document text
- https://vinebikeja.weebly.com/uploads/1/3/4/7/134712271/7073866.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4409797/normal_60108e5f2268c.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4454559/normal_5ff67391638e5.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4463785/normal_5fcde1ea64c67.pdfIn PDF document text
- https://jurujixomegisi.weebly.com/uploads/1/3/4/7/134745805/bcfe19bb.pdfIn PDF document text
- https://kixifosesezor.weebly.com/uploads/1/3/3/9/133998007/7e65b68d.pdfIn PDF document text
- https://mejuxubewa.weebly.com/uploads/1/3/4/0/134041058/nurakowarovav.pdfIn PDF document text
- http://bokugoso.22web.org/how_to_get_master_code_for_dsc_alarm.pdfIn PDF document text
- https://nukusuruv.weebly.com/uploads/1/3/1/8/131857442/e6b63d14bcb.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://jabukejezari.epizy.com/54574526447.pdfIn PDF document text
- http://gokimivux.rf.gd/betujudojekoxagelakolid.pdfIn PDF document text
- http://saninov.epizy.com/12010171168.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/f0b68e8e-c90d-4ff6-8b11-203c8d2707b2/gatenikejupizidobu.pdfIn PDF document text
- http://galiwasik.rf.gd/95580955771.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/7f3f33de-12e5-445a-8cfc-479be2fa7efb/how_can_you_help_students_with_auditory_processing_disorder.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/e840b1bd-06f8-422b-839f-1e41028bd79a/java_version_8_update_271_build_1.8.0_271-b09.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
- https://savannah.gnu.org/projects/freefont/In PDF document text
- http://www.gnu.org/licenses/In PDF document text
- http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
- http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d6f4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD6F4	6416 bytes
SHA-256: `62deedb54aaef669db635f4ef87d4bda5d475a8bf20633d6b56d9e4ab12fd410`
`font_01_sfnt_off0000e6c9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE6C9	5320 bytes
SHA-256: `8ad155380b8593b63f6c3ae2367f1e62a8d143fce134904ea6e41c91fdb20cac`
`font_02_sfnt_off0000f8dc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF8DC	2188 bytes
SHA-256: `0cba946a1011763a5b3d0f440c704485f6d2ad2f79782fb9b8a000d9d1d112c6`
`font_03_sfnt_off000102a6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x102A6	11144 bytes
SHA-256: `e6f7234b05746f2b0401d5fdd8b804863b15a142ce048d589007417b8a3dc036`

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