Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ed0a899c3edf213…

MALICIOUS

PDF

74.9 KB Created: 2021-02-27 02:55:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: a91a9f739938812499e592769c8309da SHA-1: 60e41a475bfd85173b4c5f7d0cf5d0e478825073 SHA-256: 6ed0a899c3edf213f65a7332b489a803625ff2b900b42ce42b7d9c80fc3eadd6
186 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, containing a large number of external links, many hosted on disposable domains. The ML classifier and ClamAV also identified it as malicious. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to lure users to malicious content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://gimoguvi.ru/award?keyword=braun+thermoscan+7+vs+5 PDF link annotation
    • https://radewisuvux.weebly.com/uploads/1/3/4/6/134689192/1350456.pdfIn PDF document text
    • https://tojaluteder.weebly.com/uploads/1/3/4/3/134384479/b16c15d54e477.pdfIn PDF document text
    • https://taburexil.weebly.com/uploads/1/3/4/3/134374137/3053358.pdfIn PDF document text
    • https://sunapibabe.weebly.com/uploads/1/3/3/9/133999858/vufanofom.pdfIn PDF document text
    • http://daparewipubuzes.22web.org/vawijinoduxexutiziji.pdfIn PDF document text
    • https://ruvawuwejijexut.weebly.com/uploads/1/3/0/8/130814193/4238400.pdfIn PDF document text
    • https://pigukoziluluz.weebly.com/uploads/1/3/4/8/134896600/raroxikivuzivagiwib.pdfIn PDF document text
    • https://neposuxanu.weebly.com/uploads/1/3/0/7/130740617/6216562.pdfIn PDF document text
    • https://fikenetefi.weebly.com/uploads/1/3/4/7/134771518/xofedazidut_gaxemuvadiwiwur.pdfIn PDF document text
    • https://cdn.sqhk.co/lexijunibul/hajdOOf/gitaw.pdfIn PDF document text
    • https://xedafiwiwez.weebly.com/uploads/1/3/2/3/132302754/xuwiri.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wesafisuki.epizy.com/kilivowipuzixezamuv.pdfIn PDF document text
    • https://s3.amazonaws.com/xurixado/31793758716.pdfIn PDF document text
    • http://womutefipile.epizy.com/corporate_authorised_representative_form.pdfIn PDF document text
    • https://s3.amazonaws.com/pilazi/new_birthday_song_audio.pdfIn PDF document text
    • https://s3.amazonaws.com/gopuze/zonukasumujomiribe.pdfIn PDF document text
    • http://luselobek.epizy.com/22092222849.pdfIn PDF document text
    • http://pesogulovuxolub.rf.gd/tomtom_go_6000_memory_card_slot.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_off0000e898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE898 5320 bytes
SHA-256: 0b35637cf5f68d02fa516f32f0b9e26b5bc7dd053723e6ed40a3cc3e3e9e51c6
font_01_sfnt_off0000fa97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA97 10544 bytes
SHA-256: 745803a847fbc3596a5b8480616acdfbc2e2001a12b76911440fd437f1f4fa0b

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