Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b8fc3104267b25b…

MALICIOUS

PDF

75.5 KB Created: 2021-03-09 13:13:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 57d33f325ee65cc479fda8afeceb4e54 SHA-1: 5ec3769726c6870913a5f49ca65e34d3f90499a2 SHA-256: 1b8fc3104267b25b6bd603c0ad56f7c5f85d654bc75243d8ee5bd2b4abcf4a5a
156 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 0.9998

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 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.
  • 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/123?utm_term=socomec+atys+g+m+pdf PDF link annotation
    • http://gubixazolela.sportsontheweb.net/msica_techno_mix_de_los_80_y_90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420592/normal_603dabafe78af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403421/normal_5fd7dd022cde8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407316/normal_6041f38f6bcd0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380223/normal_5ff27f076e137.pdfIn PDF document text
    • https://juposuwidamad.weebly.com/uploads/1/3/1/4/131406248/vojokokasopuz-fodusililareb-zaluxujefer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452595/normal_6014bc1ae25e1.pdfIn PDF document text
    • https://cdn.sqhk.co/nivazesoj/iidjbw7/39319711059.pdfIn PDF document text
    • https://cdn.sqhk.co/lesasafo/icHfrUC/tap_the_baby_frog_hd.pdfIn PDF document text
    • https://bixowupe.weebly.com/uploads/1/3/1/4/131409305/bf292a.pdfIn PDF document text
    • http://worelimupuvefam.mywebcommunity.org/burger_king_specials_breakfast_menu.pdfIn PDF document text
    • https://bilujadaju.weebly.com/uploads/1/3/4/7/134772480/wirezevu-betikite-xatutinowelok.pdfIn PDF document text
    • https://cdn.sqhk.co/menigopas/bohhihj/u_king_boxing_bag.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/fewifuwu/gatsby_themed_party_invitation_template.pdfIn PDF document text
    • http://peledopa.myartsonline.com/digitech_vocalist_live_fx_power_supply.pdfIn PDF document text
    • https://s3.amazonaws.com/gupojakami/belzona_5811_safety_data_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/juvetaso/gudijiwovuvoline.pdfIn PDF document text
    • https://s3.amazonaws.com/zowejunef/21113027925.pdfIn PDF document text
    • https://s3.amazonaws.com/laginekux/webufizipiwudexuriwafa.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_off0000e815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE815 5552 bytes
SHA-256: 73c6efac1714380382cee978f9271b6f761dfa9514a7a57bbff3ab6f0f9e19ca
font_01_sfnt_off0000fafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFA 11200 bytes
SHA-256: 072235c57ac8d80a920c5fbc5c41c7546051636903586acd7f11dc034715bb41

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