PDF malware analysis — malicious · 35f0b040aca6e1f8

MALICIOUS

PDF

82.8 KB Created: 2021-04-20 06:10:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20

MD5: dd4cca72255c9a26b58d26d9c1c34192 SHA-1: ca2f734902807d519a8a5c59cc93e5272696b1e8 SHA-256: 35f0b040aca6e1f85290e9ec0b9681834dcb39c439f3254ebb9be9566fe90f4d

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified the PDF as malicious, specifically a phishing trojan. The embedded URLs suggest a potential distribution vector for further malicious content or phishing attempts.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://dugedepap.ru/strik?utm_term=old+yeller+book+online PDF link annotation
- https://sujolatako.weebly.com/uploads/1/3/4/6/134624807/622b2b.pdfIn PDF document text
- https://poliradu.weebly.com/uploads/1/3/5/9/135991332/464960.pdfIn PDF document text
- https://sakofavore.weebly.com/uploads/1/3/3/9/133997309/xefujogazox_bujow_sozugeriwivaji_fijubutovegezek.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4393361/normal_604bad2891a21.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4374860/normal_601726923efec.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4446165/normal_6068ea58ca1c8.pdfIn PDF document text
- https://rebumazezip.weebly.com/uploads/1/3/4/8/134860465/mukitofot_vomut_sarep.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://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_a5c5b772a163422188c1c30db3ad6846.pdf?index=trueIn PDF document text
- https://938a05da-450f-421e-a59b-0448473a402a.filesusr.com/ugd/cb5dea_91354747063845269e5a049a7607c806.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/zerepuzuze/99603132071.pdfIn PDF document text
- https://s3.amazonaws.com/zijivevip/53969642220.pdfIn PDF document text
- https://s3.amazonaws.com/dapekufoxiraku/5001571651.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/1cb30d7c-a5ce-4cbd-98a4-a788326a8004/how_to_make_creamy_cajun_chicken_pasta_slimming_world.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/82ed9c48-c7ff-4399-a621-a8e69d29c013/numark_ttusb_software.pdfIn PDF document text
- https://9b08d158-0e0f-4203-9b31-e1272d977b1c.filesusr.com/ugd/086daf_d21f8209178948caa3785513e78bb795.pdf?index=trueIn PDF document text
- https://f6142301-0c02-44dd-b2c5-62cf9b3cd0dc.filesusr.com/ugd/ebfdba_1c45596c9f3a483889f552bb05441e85.pdf?index=trueIn PDF document text
- http://jemekovivokuvup.epizy.com/89960891202.pdfIn PDF document text
- http://suboxasolu.rf.gd/vuxaxowufonaviganekutapu.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_off0000fb02.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB02	4472 bytes
SHA-256: `231ec79df564fd8fb02a27e7a4a8ecc305f38f0bca4ab5175f2fbca069a7a791`
`font_01_sfnt_off00010a31.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10A31	11156 bytes
SHA-256: `7521dd7cd857c3cc7e6d7669dd90a4d37d580f835957a60266ec502178286f1f`
`font_02_sfnt_off00012fde.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12FDE	4324 bytes
SHA-256: `cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34`

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