PDF malware analysis — malicious · 9ea0bbc0da9c39a4

MALICIOUS

PDF

93.3 KB Created: 2021-02-19 17:40:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16

MD5: 35103ebfbb34ab907fad18cd845d870f SHA-1: 2b0707c68e756cb32a1358eca9fd2db49e036d58 SHA-256: 9ea0bbc0da9c39a4928d9368d7c41c59de6fb334eba355094299b7d4e9ece5e9

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document that contains a large number of embedded links, identified as a PDF link farm. One of the primary links directs to a known malicious redirector, suggesting an attempt to lead users to malicious content or further infection vectors. The ML classifier also strongly indicated maliciousness.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

Heuristics 4

PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK

PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
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.
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://yafferge.ru/strik?utm_term=basic+roleplaying+espa%25C3%25B1ol+pdf In PDF document text
- https://ruzutemeba.weebly.com/uploads/1/3/2/6/132681300/8267193.pdfIn PDF document text
- https://doxemikawapuki.weebly.com/uploads/1/3/4/3/134314999/673159.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4450896/normal_5fef934d21233.pdfIn PDF document text
- https://vewekazetuxif.weebly.com/uploads/1/3/1/3/131379326/pibet.pdfIn PDF document text
- https://cdn.sqhk.co/gonolesuzam/NidjiYI/wokelajokijodile.pdfIn PDF document text
- https://wazalitewisoka.weebly.com/uploads/1/3/5/9/135960923/1981121.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4415770/normal_5fe2dec34f6d4.pdfIn PDF document text
- https://buvapubadoloj.weebly.com/uploads/1/3/4/2/134265521/mojixekobul.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4503692/normal_5ffb9e6b5c837.pdfIn PDF document text
- https://wabuxopimigom.weebly.com/uploads/1/3/4/0/134042903/gegumuta-pududati-kijugabutudefuf.pdfIn PDF document text
- https://puxefulido.weebly.com/uploads/1/3/1/3/131383426/furab_fasododima_goloxabinun.pdfIn PDF document text
- https://zadobezaja.weebly.com/uploads/1/3/0/7/130775221/widepa.pdfIn PDF document text
- https://sukanoxe.weebly.com/uploads/1/3/1/4/131453950/8b9f6ac70a.pdfIn PDF document text
- https://xalifabosivibu.weebly.com/uploads/1/3/0/7/130775217/devipajoxugi.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://s3.amazonaws.com/lijulijowivaze/have_to_exercises_worksheets.pdfIn PDF document text
- https://s3.amazonaws.com/zusevamasor/96842651506.pdfIn PDF document text
- https://s3.amazonaws.com/potofaw/facebook_cover_template_size_2018.pdfIn PDF document text
- https://s3.amazonaws.com/tesasubawalozan/bsc_nursing_admission_form_2019_in_gujarat.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
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00010025.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10025	5684 bytes
SHA-256: `7f18fe1916ec899727c1a9afa8181e1b0354bf8ad10c07cbba220af1011f07cf`
`font_01_sfnt_off0001135a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1135A	11376 bytes
SHA-256: `05cff86a237c87b60f1f80c616e2f24d1dcd4aabc4059086d26714b251ab4667`
`font_02_sfnt_off00013967.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13967	25172 bytes
SHA-256: `7cdee4b5baa93a9562a46df57e4bc0f82514ba60c63f170a199275cb9371474f`

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