PDF malware analysis — malicious · 59c59771fbe270f3

MALICIOUS

PDF

89.2 KB Created: 2021-09-16 14:56:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 6f5db1319ac57793d19772cc1d437a31 SHA-1: d3a5cc7a822233fa60d05d07b2d5d401679c6f0b SHA-256: 59c59771fbe270f39d30f9bd5ad13974d75c1c0e3d243d610ebc23dce40bc2ee

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external links, with many pointing to unknown domains, suggesting it functions as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this behavior. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

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 http://talentfuturesservices.com/sharpinstitute/images/files/8657593078.pdf In PDF document text
- http://fcvperu.org/data/fcvperu/userfiles/file/buxiv.pdfIn PDF document text
- http://www.parkwaytransplant.com/media_upload/upload/files/tugimadopodudagilebi.pdfIn PDF document text
- https://asiquim.com/ckfinder/userfiles/files/pinebinamenej.pdfIn PDF document text
- http://sculecuacumulator.ro/app/webroot/files/userfiles/files/36965459101.pdfIn PDF document text
- http://iseveranscopy.com/upload/editor/file/87379692753.pdfIn PDF document text
- https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/digesin.pdfIn PDF document text
- http://sovaimm.it/userfiles/files/95600704733.pdfIn PDF document text
- https://thefencedocumentary.com/adminfiles/file/52430296699.pdfIn PDF document text
- http://camberwelltaxi.com/survey/userfiles/files/kebesezavewulupisepi.pdfIn PDF document text
- http://cinebuzz.be/uploads/userfiles/files/lolovasifepagusi.pdfIn PDF document text
- http://skiflogistics.ru/userfiles/file/69789040927.pdfIn PDF document text
- http://terfigyelokamera.info/files/file/butijujibufililekoga.pdfIn PDF document text
- https://oreopay57.com/ckfinder/userfiles/files/49352724758.pdfIn PDF document text
- https://pankajplast.com/ckfinder/userfiles/files/7577175654.pdfIn PDF document text
- http://paulabenveniste.com/UserFiles/file/84355380102.pdfIn PDF document text
- https://byocamacho.com/ckfinder/userfiles/files/53440579271.pdfIn PDF document text
- http://air-separation-supplier.com/d/files/42907987419.pdfIn PDF document text
- http://restravel.ru/ckfinder/userfiles/files/zatonobob.pdfIn PDF document text
- http://iseveranscopy.com/upload/editor/file/mifafix.pdfIn PDF document text
- https://martensmgt.com/business_school/uploads/file/vugokabise.pdfIn PDF document text
- https://taiwancy.com/app/webroot/userfiles/files/52169046144.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134411b45a37---57431821910.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=nulls+boom+beachPDF link annotation
- 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://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_off0000e0d9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE0D9	17992 bytes
SHA-256: `8a05404a911984b8f78e05c58686636f546565077eb44b319790a45eeba41edf`
`font_01_sfnt_off00010ed0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10ED0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000126e7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x126E7	10316 bytes
SHA-256: `04b033de251799be8ff32eb450f33dd85a8009c8898f05a720999d34c73cb7f6`
`font_03_sfnt_off00013e34.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13E34	16840 bytes
SHA-256: `637f282a09958e0217b626fc4698b4d72005eb4dad7007e6f209d5e5c10a4ef2`

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