PDF malware analysis — malicious · 471f056992224512

MALICIOUS

PDF

77.6 KB Created: 2021-02-18 07:39:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23

MD5: f7519d2a27942232e0211ba2d86996c6 SHA-1: 674b19b19be7bfa077ae720206bfc2436c960ad6 SHA-256: 471f0569922245122fddd8aad764e631116d49c0edf543d1c438f09800d1ab4e

184 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV also flagged this file as malicious. The primary IOC is the redirector URL, which is likely used to deliver a secondary payload or phish for credentials.

Machine Learning

Nyx PDF Classifier malicious score 0.9995

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
PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK

PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
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.
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://yafferge.ru/strik?utm_term=simple+easy+christmas+piano+songs+with+letters In PDF document text
- https://cdn-cms.f-static.net/uploads/4458389/normal_600f8275e162d.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4426418/normal_6022be0cc0c33.pdfIn PDF document text
- http://tumerasiwabuzip.22web.org/joxovizuzewivuxunolitixew.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4468537/normal_600720ca68036.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4454045/normal_6029e83804f6e.pdfIn PDF document text
- http://lagulatobir.iblogger.org/girlfriends_guide_to_divorce_max_season_4.pdfIn PDF document text
- http://piziguto.iblogger.org/tarewa.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4411490/normal_602815a8501ef.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4369905/normal_602459e54cdfc.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4426422/normal_5ff3febc3d07e.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4417139/normal_5feaf7463b82f.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4408004/normal_6018e039b1e82.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://s3.amazonaws.com/nuvukivaxiren/xoferiz.pdfIn PDF document text
- https://s3.amazonaws.com/bufexa/ad_free_browser_android.pdfIn PDF document text
- http://zewebuguv.epizy.com/pezediva.pdfIn PDF document text
- http://tixuxunu.epizy.com/99132895598.pdfIn PDF document text
- http://tufobiwileke.rf.gd/diagram_masters_mitosis_flip_book_answer_key.pdfIn PDF document text
- https://s3.amazonaws.com/rizijubovapuk/bosch_gsb_13_re_professional_manual.pdfIn PDF document text
- https://s3.amazonaws.com/xufoxorog/35083383116.pdfIn PDF document text
- https://s3.amazonaws.com/tiduro/barbie_games_apkpure.pdfIn PDF document text
- https://s3.amazonaws.com/rawesaragegugar/ordinal_number_worksheets.pdfIn PDF document text
- https://s3.amazonaws.com/bisegilupuf/angry_prash_photo.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
- 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_off0000dc21.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDC21	5644 bytes
SHA-256: `ea9fd708db7aedd914879ddf4e5491ae5d87427ba9208c6e49dc6c48e563965a`
`font_01_sfnt_off0000ef35.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF35	10448 bytes
SHA-256: `13e2673c473ccaf8450486976ce3196a4d3c223b73771d1f95faa6e8a93f0eff`
`font_02_sfnt_off000112c9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x112C9	16312 bytes
SHA-256: `975089639afea594160f6daa1ae948ffc4125994d61a9fd32dce02580f7b6b15`

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