PDF malware analysis — malicious · 707277f81418aaf9

MALICIOUS

PDF

82.6 KB Created: 2021-09-16 16:17:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 5815ef8756e9b0d00e35e1cbd2a05c60 SHA-1: f6db17f50119f0ea969a331955143be8b00c6e47 SHA-256: 707277f81418aaf961128a55f7335a19d6e7c9623a36f883dd500daa8b5f9c0c

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript and numerous external URIs, flagged by heuristics as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution by redirecting users to external sites. The presence of JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

Heuristics 6

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://smidgel.ru/uplcv?utm_term=pixaloop+pro+mod+apk+free+download PDF link annotation
- http://www.jindatunnel.com/up_files/file/kuvubudubumabe.pdfIn PDF document text
- http://bedrucken24.de/userfiles/file/62665077491.pdfIn PDF document text
- https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/tifugu.pdfIn PDF document text
- https://www.temtechnologies.fr/ckfinder/userfiles/files/pomoguzuvirasanepus.pdfIn PDF document text
- http://rustproofingottawa.com/userfiles/file/dulavukanupapu.pdfIn PDF document text
- http://englandmatchshirts.com/assets/file/vopidisivave.pdfIn PDF document text
- http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/tosar.pdfIn PDF document text
- http://oreade-breche.fr/userfiles/file/bupuvubabuxexabiredut.pdfIn PDF document text
- https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2e4420818---turatinizabifegax.pdfIn PDF document text
- https://nacituran.com/userfiles/file/duzikiz.pdfIn PDF document text
- http://kite-surf.sk/files/87436889636.pdfIn PDF document text
- http://kondicionery-ivanteevka.ru/upload_picture/file/sadisinodox.pdfIn PDF document text
- https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/f6tg2m0mpn55p7b039gulkskse/43217694272.pdfIn PDF document text
- https://sunrise-photon.com/upfiles/editor/files/kanoj.pdfIn PDF document text
- http://oppedisanorobertosrl.com/userfiles/files/bugiburu.pdfIn PDF document text
- http://eperon-kochersberg.com/img_db/dibupoxumelomolejomum.pdfIn PDF document text
- http://pwmtqatar.net/userfiles/file/davodibevavam.pdfIn PDF document text
- http://sk4education.com/ckfinder/userfiles/files/manokojomotepe.pdfIn PDF document text
- http://ping-property.com/user_img/files/68785440063.pdfIn PDF document text
- https://junona.manyel.website/images/uploads/medium/31384429132.pdfIn PDF document text
- https://www.abrasco.org.br/ckfinder/userfiles/files/momepuxaxejijedasirof.pdfIn PDF document text
- http://camonetinternational.com/files/file/39029079432.pdfIn PDF document text
- https://corumosmanlimakina.com/js/ckfinder/userfiles/files/84694168166.pdfIn PDF document text
- https://atlantidegattico.it/file/22455698953.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://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_off0000dd3d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDD3D	10672 bytes
SHA-256: `4721cb485036feaa2695e9cf0de012d1d4bc4a2643323d9b62f2ffd4a0a1c75e`
`font_01_sfnt_off0000f5b0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF5B0	17848 bytes
SHA-256: `aa9740a9a9332a11098a2cbb74a4eb8a60c5d635858f369a011dfcc47a11b25c`
`font_02_sfnt_off0001243f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1243F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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