PDF malware analysis — malicious · 23306bd1b7beaeb9

MALICIOUS

PDF

76.1 KB Created: 2021-03-25 22:50:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20

MD5: e2b3f9daab4484e26da695385d8f08f0 SHA-1: bf881f1abe029dfcdc2c9a228f4a7697c84429ba SHA-256: 23306bd1b7beaeb92c115f2d6a683857797e12a6f5908a18dcc9c888cd1b1d31

184 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many of which point to other PDFs hosted on disposable domains or known malicious redirectors. This indicates a link farm designed to distribute malicious content or engage in SEO abuse. The ML classifier strongly supports the malicious verdict.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

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://yafferge.ru/award?keyword=amjad+islam+amjad+books+pdf+download In PDF document text
- https://wimiwimevodozaz.weebly.com/uploads/1/3/0/8/130874111/2710457.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4483873/normal_60562b0621877.pdfIn PDF document text
- https://wivupenoremew.weebly.com/uploads/1/3/0/7/130775018/vemaduzogajew.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4366034/normal_6059432c6e1fc.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4447252/normal_6048437da307c.pdfIn PDF document text
- https://zoladikadaxupaj.weebly.com/uploads/1/3/4/6/134635808/puzugifem.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4421637/normal_5fd64c87c6467.pdfIn PDF document text
- http://kafologegodudo.iblogger.org/mujegijiwogi.pdfIn PDF document text
- http://vuvigurozinuro.iblogger.org/30247770478.pdfIn PDF document text
- https://zovijewef.weebly.com/uploads/1/3/4/4/134400079/wutoredefum_duneja_dajev.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4461766/normal_5ff4583269f28.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://627ea4a7-3f28-4bf3-8c99-6a9da7dacf48.filesusr.com/ugd/1970e2_02a13a2af0b54073b7267df31caa714e.pdf?index=trueIn PDF document text
- https://d3dd75b0-514a-4dbf-a1f7-973a5b421fb1.filesusr.com/ugd/5b46ec_3fbea4cdd5c44d85b923274199e9db24.pdf?index=trueIn PDF document text
- http://keguwaburafokul.epizy.com/fusionner_deux_en_un_seul.pdfIn PDF document text
- https://s3.amazonaws.com/wukevirenesu/annie_get_your_gun_character_list.pdfIn PDF document text
- https://e064a861-6c7b-46af-b67a-66be1f32d776.filesusr.com/ugd/ec3e4b_ed7264985261451099b0bafcc8108995.pdf?index=trueIn PDF document text
- https://2efabd41-1f95-43d0-8245-5f8eb9267247.filesusr.com/ugd/2f4ddf_6d56f2330f0b4a2b83ba1be6e0081b4c.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/kegubinefuda/avengers_endgame_full_movie.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_off0000d62f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD62F	5452 bytes
SHA-256: `e0a2812ac69b7cfc7d82f82d9170b80478564af0c1a2f767f72285835b2f0ac4`
`font_01_sfnt_off0000e8be.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE8BE	9964 bytes
SHA-256: `1903a3c3a7d2156833bec831d0f6c0f04520c990639e3e5de789a4f7c09ee615`
`font_02_sfnt_off00010b37.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10B37	16884 bytes
SHA-256: `9902e545abc105dd2b3f17f1200eb312115c0274d043820dd27b87313db7aef3`

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