Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9170f036f8e8bc7…

MALICIOUS

PDF

77.5 KB Created: 2021-03-24 08:37:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a8699a3ac67f988085132bbaaf0eb46c SHA-1: d38183be38325b461fd919a45ecf967e03b63ef0 SHA-256: b9170f036f8e8bc77a7100255e8b09b5c0abfb0fcc1ff6285caa566a18f15056
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further support this, indicating the file's primary purpose is to act as a lure for potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/wix?keyword=uno+unblocked+games+77 PDF link annotation
    • https://fexegidonowagi.weebly.com/uploads/1/3/5/3/135325594/2657005.pdfIn PDF document text
    • https://cdn.sqhk.co/vujalenan/0Y8wqij/92872897292.pdfIn PDF document text
    • https://napuximijagebi.weebly.com/uploads/1/3/4/7/134766840/c39977c1b27e403.pdfIn PDF document text
    • http://lutirojibafap.sportsontheweb.net/criminal_law_consolidation_act_1935_sa.pdfIn PDF document text
    • https://cdn.sqhk.co/derebeduno/MjgEjji/jetpack_joyride_apkpure_download.pdfIn PDF document text
    • http://reduslimitaly-official.site/gulesewawoxug7lwut.pdfIn PDF document text
    • http://bubiwikozexamo.iblogger.org/sovufugenawusi.pdfIn PDF document text
    • https://lukuxafibufogi.weebly.com/uploads/1/3/5/4/135400428/a76ed554e7.pdfIn PDF document text
    • http://saxobupazes.sportsontheweb.net/rumunobutolaset.pdfIn PDF document text
    • http://rujitexoxobag.mypressonline.com/migos.pdfIn PDF document text
    • http://zozavelomidabi.scienceontheweb.net/72111813185.pdfIn PDF document text
    • http://finuxezanasa.mygamesonline.org/brushless_alternator_seminar.pdfIn PDF document text
    • https://cdn.sqhk.co/fegukajebaj/MZhkWhh/fitness_pointe_phone_number.pdfIn PDF document text
    • https://bejokuwawij.weebly.com/uploads/1/3/4/6/134688199/vebimidodopag.pdfIn PDF document text
    • https://pazomanu.weebly.com/uploads/1/3/1/0/131069777/1711592.pdfIn PDF document text
    • https://cdn.sqhk.co/sixojifez/xifCnEh/global_citizen_festival_2019_nyc_lineup.pdfIn PDF document text
    • https://cdn.sqhk.co/loganidob/jhv99ul/sowamuwovebebejepax.pdfIn PDF document text
    • http://loziwazekon.medianewsonline.com/59869498315.pdfIn PDF document text
    • http://xevusezes.medianewsonline.com/guwotawezelojejopos.pdfIn PDF document text
    • http://bestrongbyg.com/4054159827248ns2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://firixafuzive.rf.gd/bollywood_songs_latest_hits_free.pdfIn PDF document text
    • http://zijedan.atwebpages.com/61177520878.pdfIn PDF document text
    • http://tajavuminona.atwebpages.com/jesapigakogokufuzunig.pdfIn PDF document text
    • http://filosoko.onlinewebshop.net/easy_piano_songs_pop.pdfIn PDF document text
    • http://fuluputig.epizy.com/devig.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_off0000f127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF127 5440 bytes
SHA-256: 76aa84e0cb2460d8d662a2e653ac6d5cc4119ec69f8ed41796b0cd46150ab904
font_01_sfnt_off000103a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A1 10836 bytes
SHA-256: 2a57badbd152b6e95899f924dfd1649bf010006c1364cb73e75c7f51a6003d92

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