PDF malware analysis — malicious · 4c09d1d314535e37

MALICIOUS

PDF

107.3 KB Created: 2021-06-10 06:59:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24

MD5: 587ea4fc458f60f24b17a5d419862712 SHA-1: 6a10fa7f30d275cda657fe289045bfdf55f60d51 SHA-256: 4c09d1d314535e371a0cc711122f3a4f9366a080f57517cb2f69857679380fc5

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to a site that appears to be a link farm designed to redirect users to download content, likely malicious. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the phishing and malicious redirection intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9994

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://queure.ru/pbw?utm_term=the+secret+book+pdf+free+download+in+telugu PDF link annotation
- https://cdn-cms.f-static.net/uploads/4466135/normal_601e1f9fa0474.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4384472/normal_5fddbc77b33fc.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4392871/normal_5ffa4cc2587f2.pdfIn PDF document text
- https://static.s123-cdn-static-d.com/uploads/4367617/normal_60b5c10dd2f78.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4368229/normal_603b499c5ca96.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4455380/normal_601f3a4ea4e8c.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4384822/normal_5ff2cfd2ce67f.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4406463/normal_6012719f8579d.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4475397/normal_5ff09edf21d5c.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://fedorahosted.org/lohitIn PDF document text
- http://lomubel.pbworks.com/f/8666039077.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/5b8de0aa-35d9-4efa-bd73-4b0bce115206/giwuj.pdfIn PDF document text
- http://vonodatob.pbworks.com/f/how_to_choose_rifle_scope_ring_height.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/c0a15d88-5f5f-4f7e-8c55-581aede2697a/vuranalije.pdfIn PDF document text
- http://wijozuzapusa.pbworks.com/w/file/fetch/144631068/72441098181.pdfIn PDF document text
- http://watapabipos.pbworks.com/f/1321320019.pdfIn PDF document text
- http://lezakoliz.pbworks.com/w/file/fetch/144994965/bicol_tagalog_dictionary.pdfIn PDF document text
- http://niwomif.pbworks.com/f/fate_extra_enemy_patterns_download_free.pdfIn PDF document text
- http://najapenoz.pbworks.com/f/31437205501.pdfIn PDF document text
- http://ruzezotep.pbworks.com/w/file/fetch/144867864/puxusarapaxemenobugogiva.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/da4e485e-6aad-4dc4-9617-280a30792f66/does_hangul_have_an_order.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f527.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF527	5660 bytes
SHA-256: `2fb4e64ec4783ea54df15474a9041f8c4a58b9d1a1eb0849197cc37f0874d435`
`font_01_sfnt_off00010876.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10876	48088 bytes
SHA-256: `6de39a198dd6092b887f8ce7975e7f821da7ced7030b17152121545390875106`
`font_02_sfnt_off0001636f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1636F	11488 bytes
SHA-256: `1ed7c24a228175442a0623093087d63067a4c71b76086b60790651ac9281e271`
`font_03_sfnt_off00018a57.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x18A57	16092 bytes
SHA-256: `ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073`

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