PDF malware analysis — malicious · f61bb2eb4cead898

MALICIOUS

PDF

76.5 KB Created: 2021-03-15 20:08:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20

MD5: ee561c2aa0f95a3b44417d4c76752c10 SHA-1: b3b4479f015afd0c957818d1109b7da510382ccf SHA-256: f61bb2eb4cead898b842599afe9972db6421641eadf8ed7051bbd1dce4685058

106 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample is a PDF file that contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm. The heuristic 'SE_LOLBIN_RUN_COMMAND' suggests the document text may contain commands or references to command execution, potentially indicating an attempt to exploit vulnerabilities or trick the user into running malicious code. The ML classifier strongly flags this PDF as malicious, and the presence of external URIs further supports a malicious intent, likely to redirect the user to a second-stage payload or phishing site.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

Heuristics 5

LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND

Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
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://baarspo.ru/strik?utm_term=introduction+applied+linguistics+pdf PDF link annotation
- https://cdn-cms.f-static.net/uploads/4416669/normal_6032a775ebf87.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4403130/normal_6029945a3567d.pdfIn PDF document text
- http://datinge.site/xorowizalebamukugivhs4lh.pdfIn PDF document text
- http://kataeta.club/marketing_cloud_pricingq61as.pdfIn PDF document text
- http://everydays.space/779814196538maf3.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4445889/normal_6033680fb4bfb.pdfIn PDF document text
- http://dayzcommunity.info/wexefadirodupufawulido02xf7.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4368956/normal_600fbbf6aab38.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4495854/normal_60251dfd59a83.pdfIn PDF document text
- http://shimano-stradic.ru/149552844410g5hb.pdfIn macro / runtime command snippet
- http://theporte.xyz/95481924876gl15v.pdfIn macro / runtime command snippet
- http://vigastlens.xyz/mosekamokofikulimupilo3wtw7.pdfIn PDF document text
- http://idealica-italy.site/two_digit_addition_and_subtraction_worksheets_for_1st_grade6jb3r.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4421474/normal_6004aa770118d.pdfIn PDF document text
- https://cdn-cms.f-static.net/uplIn macro / runtime command snippet
- 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://s3.amazonaws.com/lixuzo/56972432405.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/ac0eb88b-e9b9-4c9d-a8eb-62bccb9aa4a6/kutifilure.pdfIn PDF document text
- https://s3.amazonaws.com/wupuxus/17830158523.pdfIn PDF document text
- https://s3.amazonaws.com/gozilum/sezaraba.pdfIn PDF document text
- https://s3.amazonaws.com/sobaketemu/complete_list_of_cmd_commands_windows_10.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/5c0e9d2c-de5a-4b4e-8d32-13cd523aa008/157684565.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_off0000df53.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDF53	5144 bytes
SHA-256: `48d68357a33f1ea434c4a3b2856a510a3803c845fddfd654d89f92c654faef80`
`font_01_sfnt_off0000f0db.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF0DB	11108 bytes
SHA-256: `8f31892266c627cad1e00203919af49ae87b557d1588acea8b46035e6212cab1`
`font_02_sfnt_off0001168f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1168F	4324 bytes
SHA-256: `9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2`

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