PDF malware analysis — malicious · b486e4ad939a3072

MALICIOUS

PDF

89.9 KB Created: 2021-06-08 00:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07

MD5: 23cf7b6714de3c2509c8d722b12b713e SHA-1: 1370a626ceabb04186774809774e5aafa2908be0 SHA-256: b486e4ad939a3072a0ad9e533788b3a64de5b373e984bdb616eeb3667478ac66

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to a link farm, a common tactic for phishing or distributing further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

Nyx PDF Classifier malicious score 0.9995

Heuristics 5

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 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://infrive.ru/pbw?utm_term=22+carat+gold+means+in+kannada PDF link annotation
- https://cdn-cms.f-static.net/uploads/4456387/normal_60b8f37c0319e.pdfIn PDF document text
- https://naluzamuro.weebly.com/uploads/1/3/4/5/134516405/401963.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4386842/normal_605c14c667ab0.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4452626/normal_603281998e2df.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4446283/normal_605a7eebb1363.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4450502/normal_60b817757a9d4.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4402940/normal_5ff0a8c224735.pdfIn PDF document text
- https://rivatuvimib.weebly.com/uploads/1/3/4/4/134469475/bigikabenuvegotug.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4466676/normal_5fcbbee7d3621.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://www.daltonmaag.com/In PDF document text
- http://xetuduju.pbworks.com/f/how_do_i_setup_my_mailbox_on_my_phone.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/4813256a-60cb-45fd-b60a-88b08876c4ea/kegiwisuragidawuwirefone.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/f3c68476-acd1-4216-9427-fbf1522fe9b8/tipujekobinazirotikivepag.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/7c3cb4d4-c5cd-405a-8134-6ce154b666d3/how_much_does_a_script_writer_make_uk.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/1928e4e6-3872-432c-9fe0-6fe3447dd375/fexaxesovag.pdfIn PDF document text
- http://namebitepu.pbworks.com/w/file/fetch/144738033/how_many_types_of_wiring_are_there.pdfIn PDF document text
- http://midevodimu.pbworks.com/w/file/fetch/144819258/chemistry_formulas_for_class_11_and_12_free_download.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/871ab3ac-b913-4caa-8c72-1a355490de01/new_yorker_posters_for_sale.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/bfcb4fe0-6a3a-4214-af4b-acd51c8d8407/peter_drucker_books_amazon.pdfIn PDF document text
- http://jesababa.pbworks.com/f/2246436146.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/debe21af-ef28-4e6a-a67e-f5d79d9f1023/loxazibuwujotowawapid.pdfIn PDF document text
- http://pusavivo.pbworks.com/w/file/fetch/144555684/97584798809.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0001126f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1126F	5148 bytes
SHA-256: `ec30c0601dc63a4fc41843a155e776246e01b4d5f6c53a23b8dc5b4d1f2ac0df`
`font_01_sfnt_off000123c3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x123C3	11688 bytes
SHA-256: `9f64cd16d2f8a79a705a95d86ed2e946a7e1080a50e1ad8dea9a446a354ca90a`
`font_02_sfnt_off00014ba6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14BA6	4324 bytes
SHA-256: `ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230`

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