PDF malware analysis — malicious · 012bf9a2b6f4e69e

MALICIOUS

PDF

77.2 KB Created: 2021-05-22 18:28:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25

MD5: 4a3833315519189b459fbe9cbfe137e3 SHA-1: 27693189e3325ba4d4f56057ca1c6bdf4388541a SHA-256: 012bf9a2b6f4e69ec7867153828381d02b4007f581828e83f880961912f478e3

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external links to other PDF files hosted on various domains, including 'ponafet.ru'. This technique is often used for SEO manipulation or to distribute further malicious content. The presence of multiple external links and the detection as a phishing trojan suggest it may be part of a larger campaign to redirect users to harmful sites or download malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9995

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM

Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
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://ponafet.ru/strik?utm_term=wh+questions+worksheets+pdf PDF link annotation
- https://zumegopepotiko.weebly.com/uploads/1/3/1/3/131398003/bitexurojomo.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4476766/normal_601db8b549370.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4445880/normal_5fda8c0b7f986.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4455660/normal_6056e8a1f2e53.pdfIn PDF document text
- https://rozozejowetape.weebly.com/uploads/1/3/4/5/134510424/vewowijujufo_rezipumaxaxibo_fopugidoxewep.pdfIn PDF document text
- https://motonolezigit.weebly.com/uploads/1/3/2/8/132814123/3749044.pdfIn PDF document text
- https://riwusivi.weebly.com/uploads/1/3/4/9/134900433/peridojipedivux_ketivamomuzolom.pdfIn PDF document text
- https://matiposokatogu.weebly.com/uploads/1/3/0/7/130739068/telakofiwakijol.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4475379/normal_6031bf9eef1c3.pdfIn PDF document text
- https://noruwapawufibem.weebly.com/uploads/1/3/0/9/130969999/0a2d53f806.pdfIn PDF document text
- https://monotuwisax.weebly.com/uploads/1/3/4/5/134589760/b6e65a33.pdfIn PDF document text
- https://vezitiratad.weebly.com/uploads/1/3/1/8/131856143/venebixat_rezuzupojadume_zopeg.pdfIn PDF document text
- https://zaxadumumuguxe.weebly.com/uploads/1/3/1/4/131454216/f0c56574.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://www.daltonmaag.com/In PDF document text
- https://uploads.strikinglycdn.com/files/0cd90d32-d99f-4065-8bb2-84d709bf7259/26997811005.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/14b4bc47-16bb-442b-b1ec-44640f519eeb/garmin_montana_650_firmware.pdfIn PDF document text
- https://s3.amazonaws.com/gadumagabusodel/dls_2019_hack_apk_mod.pdfIn PDF document text
- https://s3.amazonaws.com/viwoxuz/20439083389.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/23b8537c-549f-42a3-9420-3598dca8c6fc/what_to_say_instead_of_alright.pdfIn PDF document text
- https://s3.amazonaws.com/nitirew/92684594481.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/e17ab907-a576-4131-914b-a86cdf5434e5/koledoxotufizolegejagojin.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/b07cec7b-2e98-4b3d-9a9a-0242121e2f91/zasurej.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/47070d7b-cb66-4d9a-b7c7-19c3de44acc2/51329879366.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e45b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE45B	5064 bytes
SHA-256: `4321cb68114b281a3c7b5df9769a84ddc20393d67f8b0be0e4b991699e400462`
`font_01_sfnt_off0000f5a4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF5A4	10460 bytes
SHA-256: `5bd3878df82b40cdb72d04a08bb2992d935c1920086d7cbff5fe1459ef02d39c`
`font_02_sfnt_off00011970.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11970	4324 bytes
SHA-256: `1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361`

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