PDF malware analysis — malicious · 88b93ec4c28bdb2e

MALICIOUS

PDF

81.1 KB Created: 2021-04-02 19:05:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24

MD5: a44a2234fea682b2c4e84c6ada267cff SHA-1: 196803a1c68903256749a0dd01034f5c143f3f2f SHA-256: 88b93ec4c28bdb2eca849a90ecab473ed7d5c6170762255ebb4eb99e24815243

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

Nyx PDF Classifier malicious score 0.9992

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 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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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://baarspo.ru/123?utm_term=ms+powerpoint+viewer+2013+free PDF link annotation
- https://cdn-cms.f-static.net/uploads/4419205/normal_6030ee26ea9dc.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4366042/normal_5fd93b2368556.pdfIn PDF document text
- https://cdn.sqhk.co/lenufetimop/gARhiib/18915430466.pdfIn PDF document text
- https://cdn.sqhk.co/rumoligodo/hD6ghKi/android_system_webview_disabled_cannot_enable.pdfIn PDF document text
- http://koprovk.xyz/hair_salon_training_manualgasnn.pdfIn PDF document text
- https://cdn.sqhk.co/bupipusojok/7ggjbic/nuxisusopuravogovuzaroxa.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4469623/normal_5fdecb27c4ca3.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4498801/normal_6035408e9214c.pdfIn PDF document text
- http://neip-forum.fun/78956922634qx2up.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4423189/normal_606696ee225ff.pdfIn PDF document text
- http://copyrightsupporthelpcenter.com/36206681275jf9in.pdfIn PDF document text
- https://cdn.sqhk.co/kufagilan/avtS8if/face_changer_app_for_pc.pdfIn PDF document text
- https://cdn.sqhk.co/loxepafigav/gipgghc/fateno.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4416789/normal_5fc5bae61bbce.pdfIn PDF document text
- http://znasila.ru/46535282267vbcpp.pdfIn PDF document text
- http://hook-up.fun/option_alpha_signals_download_fr36etw.pdfIn PDF document text
- https://cdn.sqhk.co/bunigenozav/IEgfhgg/bawli_tared_dj_remix_mp4_ing_video.pdfIn PDF document text
- https://cdn.sqhk.co/korulifesewa/ihZaMFb/38836066295.pdfIn PDF document text
- https://cdn.sqhk.co/gitovera/amko3hb/ants_in_carpet.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4501482/normal_60136084299fd.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
- https://uploads.strikinglycdn.com/files/cef2075c-ff79-49ad-b554-9ec3442b82c3/88078728192.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/95bb7dba-dbae-4b89-90e3-c7ac1d628b87/31048243461.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/d8845150-d880-453a-b291-f2dc1615a4d4/oracle_sql_developer_cannot_reset_password.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_off0000ef6d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF6D	5088 bytes
SHA-256: `f83d6fad914072f32139cb3c4f529200c5de82ac6e7ca5ce9ec8a03250da4ab1`
`font_01_sfnt_off000100ea.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x100EA	12184 bytes
SHA-256: `0bebddb3931a61222a5263533846b4fd1b375ef7a17c1acdfb74eb3983b213c4`
`font_02_sfnt_off000128c9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x128C9	4324 bytes
SHA-256: `a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f`

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