Malicious PDF — malware analysis report

Static analysis result for SHA-256 6beb13145f3a1ee9…

MALICIOUS

PDF

67.8 KB Created: 2021-03-23 01:31:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: bdf838562808e57148fb390114c60c74 SHA-1: d5f56a72b70fe132c3c01fbd8aacfb47f20d5d26 SHA-256: 6beb13145f3a1ee9a0dedd2c5649a08eac2fde6fa12e78dba08ebd794ee8b89b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on disposable domains, suggesting a phishing or scam campaign. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document is designed to redirect users to potentially harmful sites. No scripts were extracted, but the overall structure and URL distribution point towards a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://jacksth.ru/aws?utm_term=modal+verbs+exercises+pdf+perfect+english PDF link annotation
    • https://favotofuti.weebly.com/uploads/1/3/1/8/131871633/katukap.pdfIn PDF document text
    • http://moxolesapudeli.22web.org/35804699447.pdfIn PDF document text
    • http://salonlabs.xyz/2007_toyota_yaris_2_door_hatchback_reviewzxyx9.pdfIn PDF document text
    • http://tehnopolis.org/741407839397iiw.pdfIn PDF document text
    • http://bcpzonasegurape2-viabcp.com/oscar_wilde_nyc_halloweenwtupw.pdfIn PDF document text
    • http://apelsins.space/64958494150gas8h.pdfIn PDF document text
    • http://lesantyqas.online/56443166981lane5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443595/normal_6052cdcde5040.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459777/normal_60488d20dcdf5.pdfIn PDF document text
    • http://santecmb-sarl.com/15044438064b0oi9.pdfIn PDF document text
    • http://g2am2e.xyz/casper_apk_2018gc73a.pdfIn PDF document text
    • http://mx50off.info/safety_signage_for_construction_sites7p5za.pdfIn PDF document text
    • https://zekufizow.weebly.com/uploads/1/3/0/7/130775694/vavasobi.pdfIn PDF document text
    • http://reduslimitalia-ufficiale.site/46561863283adazd.pdfIn PDF document text
    • https://rojanebe.weebly.com/uploads/1/3/1/6/131637229/7239294.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://niwanabumupe.epizy.com/22229867620.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB77 5688 bytes
SHA-256: c9aeb0815e564e00ce21fb320989963b7681e352c7c0bc786065723132f3fb51
font_01_sfnt_off0000ded8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED8 9856 bytes
SHA-256: 25918fd8b220ca9cd0d62a4c8e0a535ba2ddffbf3b9ffb5d37c65957217f3a3a

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