PDF malware analysis — malicious · 04eb492bfd45ded0

MALICIOUS

PDF

88.8 KB Created: 2021-03-29 22:40:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13

MD5: ae347ff8e5513e896701b2cfb70cee15 SHA-1: c7332a3f4ccc193b1b783cc39edcde674733d836 SHA-256: 04eb492bfd45ded074150914d46b82675f3ba33b7cfd874e7e41f3c00387de82

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. The file contains a large number of external links, many pointing to disposable hosting, suggesting it functions as a link farm or SEO spam document. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' indicate the primary goal is to redirect users to external sites, potentially for phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9996

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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://nipisod.ru/123?utm_term=chemical+bonding+notes+pdf PDF link annotation
- https://cdn-cms.f-static.net/uploads/4466689/normal_603231b466780.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4476285/normal_600d1bdf46b36.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4402280/normal_5fe610e407b79.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4413112/normal_601a5cf05a122.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4383703/normal_604e376a39470.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4465539/normal_5fd77efebb226.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4427300/normal_5fee61bd4e9e2.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4379614/normal_5fd312290892b.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4490754/normal_603b603123b34.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://cc4f1b1a-08c7-467e-bb5a-e3073ad8caf1.filesusr.com/ugd/ffc175_b58fae1396b1435d850ca9ff5c8b3f89.pdf?index=trueIn PDF document text
- https://uploads.strikinglycdn.com/files/97dc29ad-4d2e-447d-b54b-1bbd91fe12da/positive_words_that_start_with_e_to_describe_a_company.pdfIn PDF document text
- https://a804c8a8-fdf7-4fba-b19b-c23aecc29597.filesusr.com/ugd/a7074a_e0e536dd02784f8590be565b58831c8b.pdf?index=trueIn PDF document text
- https://30f21d72-2b41-4965-a7bc-2abb02bf1ded.filesusr.com/ugd/47e66e_dda3f072c8294d738b0ba54f088c417c.pdf?index=trueIn PDF document text
- https://393102e6-89af-4738-8cad-89662dba8dc5.filesusr.com/ugd/33a16d_4ea8933360a84a3b8bb3b366f57e2b05.pdf?index=trueIn PDF document text
- https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_ede5ab4361e341e88070e75e5772e8e1.pdf?index=trueIn PDF document text
- https://6bfd3344-23d3-4e03-ab7d-00c1c23eecf6.filesusr.com/ugd/be19e1_a2b22a3d6fbf4525a895e41e4a151ea2.pdf?index=trueIn PDF document text
- https://9cf5cc10-3c2e-4e30-ae6b-73ed7beed88a.filesusr.com/ugd/5c2b46_4c6f79dd1f334db6afbb5e39d188c2c0.pdf?index=trueIn PDF document text
- https://uploads.strikinglycdn.com/files/cae59985-e2df-4684-a648-769142b1c205/10168809919.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/4473d7ee-ab50-42c7-8d94-aa97837bf91e/82013661392.pdfIn PDF document text
- https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_0a3f7c982dcc4f40a1b88b587ed4d5af.pdf?index=trueIn PDF document text
- https://uploads.strikinglycdn.com/files/b3bfb9d3-483e-49ad-93dd-2190295c8619/kitchenaid_stand_mixer_glass_bowl_dishwasher_safe.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_off000104b7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x104B7	5520 bytes
SHA-256: `13fc533699ccddad82f8349ddafe4f241f50cc63d7b47df9f868224f9905fd5f`
`font_01_sfnt_off0001174e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1174E	11860 bytes
SHA-256: `1ac3d78305e7bc4ec4a6e53b6faa6dcaee72efca52c149e58fb4521c2aa5d426`
`font_02_sfnt_off00014019.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14019	16256 bytes
SHA-256: `a5b69a8d497920c409cf89d6d504b51368e402facafb9f5e43d3aa53d606c49e`

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