PDF malware analysis — malicious · d494eb2515103efc

MALICIOUS

PDF

110.7 KB Created: 2021-05-29 16:51:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24

MD5: 8662001b1cddaa98b832a9da78452066 SHA-1: 2a0d2f840055fab6bbf8a7ddc7e186b4c32e3e05 SHA-256: d494eb2515103efc2840e459cb9352ea4649729ead3ec4b6cc43e855e318d31b

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to PDF files hosted on various platforms, suggesting a link farm or redirection mechanism. One of the primary URLs, 'https://xezojetit.ru/strik?utm_term=asm+study+manual+for+exam+fm+12th+edition+pdf', is presented as a study manual, likely a lure to encourage clicks. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 5

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.
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://xezojetit.ru/strik?utm_term=asm+study+manual+for+exam+fm+12th+edition+pdf PDF link annotation
- https://gekanabedo.weebly.com/uploads/1/3/4/3/134318260/525095.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4370051/normal_5ff1b2082787d.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4444100/normal_5fe8fddedd49e.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4461497/normal_5fe4ba866387d.pdfIn PDF document text
- https://static.s123-cdn-static-d.com/uploads/4476596/normal_60b06d3ed51a3.pdfIn PDF document text
- https://resojuwow.weebly.com/uploads/1/3/4/3/134351964/3e06cf7157778.pdfIn PDF document text
- https://pimuvetu.weebly.com/uploads/1/3/4/6/134635596/9732767.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4415526/normal_6040777657071.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4463808/normal_603da10e85d66.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4408995/normal_5feeb9a678a9c.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4391037/normal_604493097eff9.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4481067/normal_604e4f4c55766.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://uploads.strikinglycdn.com/files/9d0ac7d6-4d24-40d7-acca-f393b14d62e2/92422113371.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/aa56e915-ce8d-4d11-a25f-3926cbeb6b92/shapes_and_color_worksheets_for_kindergarten.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/b71cc79d-8392-462b-84e1-faa42c36752f/nuzuwoginobupevof.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/07836472-0e14-46a1-a5f7-3b55eb869c3b/47599810353.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/a80e3b73-aa0c-4196-82ae-5e23e9d69f2d/39042742430.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/8c31057d-9a82-40e9-aace-1edcbe9733cb/tolomefu.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/9fc7ef9d-5162-461a-9bc9-1fcc814f909e/95502015065.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/4866956f-214d-4a99-b6a3-c17c26a780f3/how_to_clean_keurig_with_brewer_care_kit.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
`stream_002_off0000e306.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xE306	48108 bytes
SHA-256: `f80942c4abec97c80c74458598523cc21467e8ade27b2613b47ff51c7b0b61d2`
`font_01_sfnt_off0001752f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1752F	5624 bytes
SHA-256: `dff720a73b7525ace1ffd49d4676a88fcdaee59ed853c03d262497ae3a9c663d`
`font_02_sfnt_off00018836.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x18836	10232 bytes
SHA-256: `b39126d204572fe930171689e66f9fb80a5806e3bb31cef27b6cbb9b6776dd8e`

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