PDF malware analysis — malicious · 1d4b060db158e486

MALICIOUS

PDF

81.7 KB Created: 2021-06-07 22:40:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13

MD5: b8bf7005f04e661d432e21e5faf3e198 SHA-1: d42089df2e2e0d9378d97342d2e901122eb1a642 SHA-256: 1d4b060db158e486738ca06ff3b0ebaff4497969d636788c65579ed86f13f48d

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malicious content delivery attempt. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially harmful sites. The document body, though partially corrupted, suggests a lure related to 'English reading comprehension worksheets'.

Machine Learning

Nyx PDF Classifier malicious score 0.9991

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://vilenefex.ru/123?utm_term=english+reading+comprehension+worksheets+advanced PDF link annotation
- https://static.s123-cdn-static.com/uploads/4452587/normal_6002fe5a7b1bd.pdfIn PDF document text
- https://static.s123-cdn-static-d.com/uploads/4487419/normal_60b56400d85c9.pdfIn PDF document text
- https://koxokigibobov.weebly.com/uploads/1/3/4/6/134600250/5158985.pdfIn PDF document text
- https://wadidomewagu.weebly.com/uploads/1/3/2/6/132681938/b10b392.pdfIn PDF document text
- https://bidutujube.weebly.com/uploads/1/3/4/4/134403342/5889451.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4375340/normal_5fc60a4418343.pdfIn PDF document text
- https://teregurejojexol.weebly.com/uploads/1/3/4/8/134879353/4e8d8b4ea06b06d.pdfIn PDF document text
- https://bixavovene.weebly.com/uploads/1/3/0/7/130775743/9306339.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4450907/normal_5fd0416dd0725.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4366335/normal_5fcd7d94decb2.pdfIn PDF document text
- https://vozopameniv.weebly.com/uploads/1/3/4/5/134593493/rodatewufer.pdfIn PDF document text
- https://xubebivox.weebly.com/uploads/1/3/5/3/135392957/62dbad7c5f6.pdfIn PDF document text
- https://static.s123-cdn-static-d.com/uploads/4465548/normal_60b115bf165f9.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4370543/normal_60226c8715fbd.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4372399/normal_6002bc29d1af4.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/54bcec8c-cad9-4d63-8419-614ae8052f2c/the_mabinogion_tetralogy.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/61740a4f-385d-466f-981d-ce1f6a0c8043/what_is_kenmore_acceler_ice.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/fd3fe35a-b8d6-4f6f-af04-b448fe01e8ef/32835319558.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/2bb19c32-3752-4711-a044-cded35097b1d/dogunovekofixowujupufibet.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/826ac913-c573-4636-8a94-af14d33518b4/heroes_and_saints_quotes.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/474a0972-e9cb-4302-8595-4880cc62d7ec/nubitomoj.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/e6cb846b-61e5-44f7-8c29-c390062fee6a/10707460472.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/42cd5a00-0009-4056-890c-48d71c861310/flowermate_v5.0_review.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_off0000f1d2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF1D2	5448 bytes
SHA-256: `5c5dc234d9ced741d7eb3ebfe6a30120cdca5c8021836d73511575b97526e8a9`
`font_01_sfnt_off0001043d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1043D	10892 bytes
SHA-256: `be4bd78159f9ac1e74c30fd40427cafc1872647b0b77353db387be72e3933c75`
`font_02_sfnt_off00012930.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12930	4324 bytes
SHA-256: `9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2`

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