PDF malware analysis — malicious · b8785cbbdf270322

MALICIOUS

PDF

84.8 KB Created: 2021-09-11 20:54:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02

MD5: 4e00b9950183a6e35f902340bade1d56 SHA-1: 6f9679ea1f4c5d81a7b47a76fde66601976d4375 SHA-256: b8785cbbdf270322ad0a8debcef5ee84df4aead8e06f02d9ac0e42946f764370

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as a malicious PDF by ML classifiers and ClamAV, indicating a phishing or trojan payload. The PDF contains numerous embedded URLs pointing to a link farm, a common tactic for distributing malicious content or conducting phishing attacks. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to potentially harmful websites.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

Heuristics 5

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://sukienmiennam.com/userupload/files/wowede.pdf In PDF document text
- https://ecoolteh.eu/galeria/file/wadojukanokob.pdfIn PDF document text
- http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613013b14f887---12055783674.pdfIn PDF document text
- http://teresachild.com/upload/files/nonebigumuxuvoxomit.pdfIn PDF document text
- https://cqhuaan.myhost360.cn/upload/files/09-06-05-54-37-26.pdfIn PDF document text
- https://micro-logic.ro/images/uploaded/file/91314129795.pdfIn PDF document text
- https://rgcsmt.org/ckfinder/userfiles/files/tavegerapuw.pdfIn PDF document text
- http://csc-028.com/userfiles/file/20210903074815_g5pc0j.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c17e99610---77511542954.pdfIn PDF document text
- https://alyosserspneed.com/userfiles/files/12892895685.pdfIn PDF document text
- http://email-database.info/userfiles/file/73738304321.pdfIn PDF document text
- https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/nutapunavuzebavurabek.pdfIn PDF document text
- http://royal-pizza.eu/files/file/xiximadidigonupen.pdfIn PDF document text
- http://chinahk-ip.com/chinahk_ip/html/files/editor/file/93234329201.pdfIn PDF document text
- https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/51024419534.pdfIn PDF document text
- http://studiotecnicostradi.eu/userfiles/files/72297114804.pdfIn PDF document text
- https://dom4m.de/userfiles/files/sujad.pdfIn PDF document text
- http://yearbookplus.com/uploads/ckfinder/files/14901517518.pdfIn PDF document text
- https://rdsdealers.com/ckfinder/userfiles/files/26843003079.pdfIn PDF document text
- https://podiummagazinenews.com/ckfinder/userfiles/files/fepisadubaluliruvibepe.pdfIn PDF document text
- http://branonperformance.com/ckfinder/userfiles/files/54984721858.pdfIn PDF document text
- https://psychologgia.pl/Upload/file/89231332033.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=comic+life+android+appPDF 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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e8dd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE8DD	17332 bytes
SHA-256: `83d48d63bb21ce53a40fcbd9a16caf609a9b75fdefba575ff273c948b5ed5c34`
`font_01_sfnt_off0001157c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1157C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012d93.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12D93	10544 bytes
SHA-256: `53965bdfe072f3da6961218052e3f33f8758585842d587da69acc5c379a33e60`

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