PDF malware analysis — malicious · 16842c0b58dcbae7

MALICIOUS

PDF

55.8 KB Created: 2020-10-28 23:05:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14

MD5: a5a9c3c4d757a4adc3597ab96d6d1eb8 SHA-1: 3e19119bdd4b5a7f660c982f77a1178e2ceb956c SHA-256: 16842c0b58dcbae7a680c7d3c46f93bb7d0f9fe25a3c8a64355777c35bb7c0b0

184 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector and another for a large link farm on disposable hosting. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are likely intended to lead the user to malicious sites, potentially for further exploitation or phishing.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

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://ggtraff.ru/strik?keyword=phosphorus+pentafluoride+ionic+formula In PDF document text
- https://saxibodusazo.weebly.com/uploads/1/3/0/7/130740440/78e93a.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4369160/normal_5f8f1868ef664.pdfIn PDF document text
- https://galebekamabe.weebly.com/uploads/1/3/4/3/134305591/f746a9bac00e7.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4392209/normal_5f8e447045999.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4365525/normal_5f873e69555f8.pdfIn PDF document text
- https://pevinuwipe.weebly.com/uploads/1/3/0/8/130873962/8383969.pdfIn PDF document text
- https://rimosuvifakub.weebly.com/uploads/1/3/4/3/134310068/soladekobakad.pdfIn PDF document text
- https://nipufijupetobug.weebly.com/uploads/1/3/1/4/131482996/855a07bdfa.pdfIn PDF document text
- https://finazodaxuvoj.weebly.com/uploads/1/3/2/6/132682535/dodafisetam-kilexus-vanagolidu-purufozedijiwi.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4366668/normal_5f8731ba3d452.pdfIn PDF document text
- https://nizesuvijeva.weebly.com/uploads/1/3/1/6/131607023/5999a2.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/tawosutosuxi/57686605839.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/8e46333b-453d-4636-9247-0386bb913358/tinoniluj.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/86e34314-6397-47ad-bebd-72073459d2f7/88599953431.pdfIn PDF document text
- https://s3.amazonaws.com/sugaguxagu/nofosesilifudukix.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0480/3798/6463/files/clash_of_clans_town_hall_8_tips_and_tricks.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_off00008516.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8516	5396 bytes
SHA-256: `16bb38f1e09ba5dd3cb9840d26e5a2346816c92b7055b811baeb0d89c9f68aee`
`font_01_sfnt_off0000974b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x974B	11020 bytes
SHA-256: `8286ceba1b4c8e6c525293f2c75a0b25b2b177038c20a379385b99b4ad74730c`
`font_02_sfnt_off0000bd0b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBD0B	16100 bytes
SHA-256: `e8be64a599b4775abf69106d1ea2a605297721d8ccc8071fb3d67c702b09cfa6`

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