Malicious PDF — malware analysis report

Static analysis result for SHA-256 aebc6c14c85ebf61…

MALICIOUS

PDF

82.3 KB Created: 2021-06-07 12:05:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: d87729fbd74ad3dcb8163655e141ba66 SHA-1: 6665c0dd39637b34225868307352e26606915f2a SHA-256: aebc6c14c85ebf61d57b64453b97103946400fe88aff8f9fc2ab2b5795dca785
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://krisoc.ru/pbw?utm_term=mejores+juegos+android+offline+gratis PDF link annotation
    • https://radalumimobexod.weebly.com/uploads/1/3/5/9/135957078/d3993204a03437.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414500/normal_60322d95075bc.pdfIn PDF document text
    • https://gixejeti.weebly.com/uploads/1/3/4/3/134326891/33357.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411923/normal_5fda47df7710b.pdfIn PDF document text
    • https://wopaxosidavi.weebly.com/uploads/1/3/4/7/134732603/7197963.pdfIn PDF document text
    • https://fenitejum.weebly.com/uploads/1/3/2/3/132302819/xororuza-zolapif-xosuwobideke-lokaxerofix.pdfIn PDF document text
    • https://nosozekime.weebly.com/uploads/1/3/4/6/134634018/4128160.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487187/normal_600fac5926675.pdfIn PDF document text
    • https://vojosapixetogal.weebly.com/uploads/1/3/4/7/134770394/7d82de9b7e86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486552/normal_601bba448b893.pdfIn PDF document text
    • https://faxigokoge.weebly.com/uploads/1/3/0/7/130775726/316eaeb886.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486522/normal_603d59178a237.pdfIn PDF document text
    • https://bokosemebejira.weebly.com/uploads/1/3/0/8/130813317/3941714.pdfIn PDF document text
    • https://funifagokose.weebly.com/uploads/1/3/2/6/132681236/zulur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379984/normal_600aec848dd8f.pdfIn PDF document text
    • https://zanonolupurezo.weebly.com/uploads/1/3/3/9/133997165/cd2c6f884cf5ff9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503309/normal_604115c66a257.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wikoborumun.pbworks.com/f/canon_f_158_200.pdfIn PDF document text
    • http://tarogifere.pbworks.com/w/file/fetch/144772035/41355788419.pdfIn PDF document text
    • http://lekuzax.pbworks.com/w/file/fetch/144419187/do_blue_dye_tests_always_have_a_faint_line.pdfIn PDF document text
    • http://pafunanukexe.pbworks.com/f/descargar_we_are_your_friends_espaol_latino.pdfIn PDF document text
    • http://fepewuwakow.pbworks.com/w/file/fetch/144562329/lubobiweka.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_off000100cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CC 5156 bytes
SHA-256: aed4e4bb73cd5e79ec6ff47c5a481f192cd36258e77dbf0bea34d4f988229e92
font_01_sfnt_off00011276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11276 12272 bytes
SHA-256: d9e82cd04db8e17d59b0d2044fd1386d31fab641616cf7961f60281bd0cf7387

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