Malicious PDF — malware analysis report

Static analysis result for SHA-256 31622751223ce36f…

MALICIOUS

PDF

100.3 KB Created: 2021-02-26 08:27:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 6f94474fc4b9ccaa96c62b0d206ec914 SHA-1: 69c8d82ca30dd8257cf06940c59dc8988040303a SHA-256: 31622751223ce36f393385ac79b59303bb2ae953645e03e2e7742f17dd7537ac
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 0.9998

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://maypoin.ru/123?utm_term=basic+electrical+network+theory+pdf PDF link annotation
    • http://trafikcezaodebayisi.com/overlord_light_novel_volume_12_translation3l035.pdfIn PDF document text
    • https://cdn.sqhk.co/towinomer/rjeoSgd/desozuponuxibunuforegi.pdfIn PDF document text
    • http://podjem2.club/rakitifusikitoxebexr5uv7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386852/normal_60362252a84fc.pdfIn PDF document text
    • http://rat-red.space/iatf_16949_auditor_training_onlineysejr.pdfIn PDF document text
    • https://jameropavide.weebly.com/uploads/1/3/4/6/134699307/fovulesu.pdfIn PDF document text
    • https://xalitizamer.weebly.com/uploads/1/3/4/8/134863297/8911149.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485163/normal_5fe0553554743.pdfIn PDF document text
    • https://forajezar.weebly.com/uploads/1/3/4/1/134108615/3415542.pdfIn PDF document text
    • https://boleturem.weebly.com/uploads/1/3/4/3/134398498/cda20.pdfIn PDF document text
    • http://tijudozi.scienceontheweb.net/hp_deskjet_2546r_wifi_setup.pdfIn PDF document text
    • https://ledajesaler.weebly.com/uploads/1/3/4/0/134041179/727022.pdfIn PDF document text
    • https://cdn.sqhk.co/lolumebitana/cUzifOD/garapumijuruvebositudari.pdfIn PDF document text
    • https://cdn.sqhk.co/jenexovu/bhjvdgj/e-_learning_app_development.pdfIn PDF document text
    • http://microbestdigitalmeter.xyz/pimopizuvurijerifazaxq2xf1.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/kikunojulejuj/i_got_sun_in_my_pocket_lyrics.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.

FilenameKindSourceSize
font_00_sfnt_off0001334c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1334C 5552 bytes
SHA-256: a55a31425c7df7daf9d05797eac2796c8ac6ada18511dd78e1b767cf58f43723
font_01_sfnt_off00014642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14642 11892 bytes
SHA-256: e1def582697e32e7798e6a1ca0a98603b5e4862ab2b4a9a7e8c4789579e95937
font_02_sfnt_off00016edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EDC 16084 bytes
SHA-256: 249651805b0a8f5b4743f17da7e3943b18be49f9c75a96c0f18a2f62b87e55bb

Open this report in the interactive analyzer, or submit your own file for analysis.