PDF malware analysis — malicious · 7f823c2caa5e2aa1

MALICIOUS

PDF

75.0 KB Created: 2021-04-05 22:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18

MD5: 5bda9b91a03694c5e523f062a92b9212 SHA-1: bb7787d76b6f3b12dcd523280bee181b442734fa SHA-256: 7f823c2caa5e2aa1ed7089ba4b34e511e40e1cde7ff5d61198c77a69089f0f74

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URLs, many hosted on disposable domains, and is flagged by ClamAV as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely to direct users to malicious content or phishing pages. Although no scripts were explicitly extracted, the PDF structure and URL patterns strongly suggest a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9991

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://resalured.ru/123?utm_term=asme+code+simplified+pdf PDF link annotation
- https://cdn-cms.f-static.net/uploads/4496584/normal_605caaab4cf9e.pdfIn PDF document text
- http://dozazexopavo.22web.org/belaseshe_film_songs.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4380881/normal_601c60873ba5f.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4374373/normal_604302883dde8.pdfIn PDF document text
- https://cdn.sqhk.co/dudugetogi/ijjjia6/stack_ball_blast_through_platforms_apk_mod.pdfIn PDF document text
- https://jitugexe.weebly.com/uploads/1/3/0/9/130969989/868e8d8e.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4406812/normal_5ff5b250397b7.pdfIn PDF document text
- https://cdn.sqhk.co/xavexapoxiv/hWjjvia/british_superbike_championship_2019_riders.pdfIn PDF document text
- https://cdn.sqhk.co/guvevifowo/m1Kiel0/11086866694.pdfIn PDF document text
- https://cdn.sqhk.co/joxesinejag/ghfFiaf/zekasubu.pdfIn PDF document text
- https://cdn.sqhk.co/bisidilit/gjxkWgi/89498076579.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4382953/normal_5fe9b66c81f83.pdfIn PDF document text
- http://getsol.xyz/ch_14_hw_concept_map_comparison_of_somatic_and_autonomic_nervous_systemsl3sd8.pdfIn PDF document text
- http://kelnoteres.xyz/7967770911076la6.pdfIn PDF document text
- https://neriborotarisim.weebly.com/uploads/1/3/4/3/134345051/3905061.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://zixagoku.rf.gd/colors_in_spanish_and_english.pdfIn PDF document text
- https://11627308-8c8f-4f08-99ed-0ad85160907d.filesusr.com/ugd/682d1c_9906cb1fa1f8409d979e02fc9479a3d5.pdf?index=trueIn PDF document text
- http://mevidow.epizy.com/nco_evaluation_report_support_form_character.pdfIn PDF document text
- http://tewejifofobaj.rf.gd/aqw_le_bot.pdfIn PDF document text
- https://569e8712-2873-4b93-a654-ea71b6b809e3.filesusr.com/ugd/345929_25668c1f65ae4aaf837c3dd6b28bbb8e.pdf?index=trueIn PDF document text
- http://merapuw.epizy.com/format_date_anglais_lettre.pdfIn PDF document text
- https://2065f6f1-29fb-48ac-a230-4f4ab2d4b746.filesusr.com/ugd/b62953_86e48da91dab49fcb4062458783c011f.pdf?index=trueIn PDF document text
- https://f77c8dad-41d7-4a8f-8d8d-c05149a3a236.filesusr.com/ugd/36d413_603dd38c1c2e4639b3702284a8ef4e58.pdf?index=trueIn 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_off0000db3a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDB3A	4584 bytes
SHA-256: `aa910eee3f6ccd62c8972224c9e09755ff3819acb59d31adc554fd4ebeb73a47`
`font_01_sfnt_off0000eac5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEAC5	10976 bytes
SHA-256: `2cbe5be468a6df5c17d78eb169a624988ee62ce441f9c40f8a7c3292daa97c69`
`font_02_sfnt_off00011078.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11078	4324 bytes
SHA-256: `cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34`

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