Malicious PDF — malware analysis report

Static analysis result for SHA-256 908f394b271b7889…

MALICIOUS

PDF

72.3 KB Created: 2021-02-20 17:43:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 123e77c840131ed2e8f4949b7e74834b SHA-1: 6121cdebf64354daef9c0bb26ea8222957d75911 SHA-256: 908f394b271b7889bf187eb38503f8231cd09bb52f6adfc5aa01ec21a75f12da
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 0.9996

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://baarspo.ru/wix?keyword=daily+paragraph+editing+grade+7+answers PDF link annotation
    • http://help-nanny.site/national_geographic_magazine_contributor_guidelinesnafpk.pdfIn PDF document text
    • http://xtrading.buzz/kibezutivazot2e01.pdfIn PDF document text
    • https://ruwegevenimeva.weebly.com/uploads/1/3/0/9/130969935/vuzedole_kulifes_lutox.pdfIn PDF document text
    • http://freedate18.xyz/comets_asteroids_and_meteors_answers2lc29.pdfIn PDF document text
    • https://girawosanisab.weebly.com/uploads/1/3/0/7/130740609/8498726.pdfIn PDF document text
    • http://videohost.space/asphalt_7_apk_data_free0kx2o.pdfIn PDF document text
    • https://fiwofufoneronup.weebly.com/uploads/1/3/1/0/131071066/3288741.pdfIn PDF document text
    • http://teenagetutor.online/bob_evans_lunch_menu_prices9wi85.pdfIn PDF document text
    • http://health2health.online/52523373485vj38t.pdfIn PDF document text
    • http://instgramcopyrightdispute.com/tujalunanogupawomu27kin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471946/normal_6019b9db7fba9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369773/normal_600b26146166f.pdfIn PDF document text
    • https://murafasonuralab.weebly.com/uploads/1/3/5/3/135398902/bininowedo-wubeged.pdfIn PDF document text
    • http://circleshtang.xyz/transmissive_reflective_structural_color_filters_theory_and_applicationsu3p0e.pdfIn PDF document text
    • http://ccckkkkk.space/vematemonuzivut3yry.pdfIn PDF document text
    • https://fosaxobe.weebly.com/uploads/1/3/4/8/134882536/1a7bbc3493.pdfIn PDF document text
    • http://contentmedialiteracy.com/14280240247bm2.pdfIn PDF document text
    • http://gtomishebs.xyz/pezuvebelifarasosqw2bn.pdfIn PDF document text
    • https://mosejibufo.weebly.com/uploads/1/3/4/4/134437632/3b0dd241b.pdfIn PDF document text
    • http://bigswinner.space/10077902069alm0g.pdfIn PDF document text
    • https://poximixej.weebly.com/uploads/1/3/0/7/130776069/mofavifupenotamidim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000dcf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF0 5492 bytes
SHA-256: d79b5dc28f75afc31cb69a6d0b679ed7c81df45b467bdb05f5f16b658483181c
font_01_sfnt_off0000efbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBE 10340 bytes
SHA-256: 1e5e9b64e1e3cc0a498af1f5253ffa23b463b4d87116589d4a7d0d499e4b11ac

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