PDF malware analysis — malicious · 31a67b1bfa829dfc

MALICIOUS

PDF

78.5 KB Created: 2021-03-25 10:24:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20

MD5: 40de0c020cf2eeefb86046f68b755004 SHA-1: cc0470006dfaff3f6b1a29c06599c7baeb154909 SHA-256: 31a67b1bfa829dfcbd017d12c3f89796a3c4c1f3da97ce1c80fa55db0d601bf8

244 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to potentially malicious or disposable hosting domains, indicating a link farm or SEO spam campaign. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a URL leading to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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
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.
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.
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://crophysi.ru/award?keyword=building+information+modeling+pdf+espa%25C3%25B1ol In PDF document text
- https://cdn-cms.f-static.net/uploads/4388421/normal_60592f1d70f6f.pdfIn PDF document text
- http://italywow.info/bully_apk_data_apkpure8y6pr.pdfIn PDF document text
- https://sezitoxonuga.weebly.com/uploads/1/3/4/8/134886233/neretimu_kufota.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4482853/normal_603e326dc0b4e.pdfIn PDF document text
- http://ibkreactiva2020.com/iso_31010hzw95.pdfIn PDF document text
- https://mogatuzutixu.weebly.com/uploads/1/3/4/6/134684840/601e97fd8.pdfIn PDF document text
- https://vugesajovor.weebly.com/uploads/1/3/4/2/134265649/resalaj_kuzava.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4413457/normal_5fe4d32315c3e.pdfIn PDF document text
- http://erogancolumbia.site/crowdy_head_surf_reportc8c4s.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/jebokizez/dafovoxosusuxedivawi.pdfIn PDF document text
- https://d451e762-8e00-4155-9971-9512d28d2528.filesusr.com/ugd/b52961_ce11a977abf04c539c66ab1b9d35ae5b.pdf?index=trueIn PDF document text
- https://9370005b-87d8-49d8-b27c-18dce193a2f1.filesusr.com/ugd/52ea04_91a48f6711054060af0a34994535eed3.pdf?index=trueIn PDF document text
- https://976edc35-935c-46de-9e6e-e225dbc25668.filesusr.com/ugd/0829d8_d7b7b132fdb14bfc8c940eb685cba9a9.pdf?index=trueIn PDF document text
- https://d1897088-ef6e-4b60-8303-910b4b551fc1.filesusr.com/ugd/4cfbbd_397431b01b714e8c8b852f6c4f8b4575.pdf?index=trueIn PDF document text
- https://1416a32c-f91c-4ec3-9c10-bfdf610c7df7.filesusr.com/ugd/76de1a_7451f2a4d04647b88d1ca3096a3fed77.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/lolijexejomak/beyond_531_1.4.pdfIn PDF document text
- https://5f90d536-2a72-4461-adff-280afd3056cb.filesusr.com/ugd/27c394_741eaf44b78f4a38912a3c89cc0def03.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/sisaxu/generation_of_antibody_diversity.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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000ef1f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF1F	5624 bytes
SHA-256: `32f792d3f9bc340395dcff3f7bca949ac42ccb7a77648ece5348fec61fd76b20`
`font_01_sfnt_off000101e8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x101E8	12320 bytes
SHA-256: `feebe34ce8c3d03a961fd2fb118e42b2981d0a22c6700ba010ba8000f0be1caf`

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