Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b603617ab837e78…

MALICIOUS

PDF

83.5 KB Created: 2021-05-20 21:40:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 327ccf2930b219827c6eeec04e84f861 SHA-1: a87cfcaf435743071ee7c453c632271ece029dc8 SHA-256: 8b603617ab837e7885779cf2069f62e3917e08e1e2b733489d9dfb691d6a7bcf
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs with numeric slugs, indicative of a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm are common tactics for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://wunenogapo.weebly.com/uploads/1/3/4/5/134509221/b7772300d8.pdf
    • https://pudozewo.weebly.com/uploads/1/3/4/3/134311846/gulikagipawawox-fapiku-bonubogaku-pazopenelekukop.pdf
    • https://sumejuloluguwir.weebly.com/uploads/1/3/5/3/135390827/fupikexefi-xusesuginiz-dilut.pdf
    • https://tosofovopige.weebly.com/uploads/1/3/3/9/133998067/119df7c6c69785b.pdf
    • https://sekikeke.weebly.com/uploads/1/3/4/7/134739811/malasejorova_zojevapake_fumoxora_vewuwerixize.pdf
    • https://sufudoni.weebly.com/uploads/1/3/4/8/134853368/nufamusoniku_kejire_nekomagegejafot.pdf
    • https://nexajatolotol.weebly.com/uploads/1/3/4/3/134308242/1d47b.pdf
    • https://tijirurilulade.weebly.com/uploads/1/3/4/3/134312421/583515.pdf
    • https://litukepulaj.weebly.com/uploads/1/3/4/8/134863372/rokoro_xatesi.pdf
    • https://foziwumiwogesis.weebly.com/uploads/1/3/5/3/135321673/favikekedujatuzixive.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://feedproxy.google.com/~r/wb/ENAH/~3/o_fyKxYoRT8/wb?keyword=diary%20of%20wimpy%20kid%20rodrick%20rules%20free%20online
    • https://s3.amazonaws.com/vasofirida/define_democratic_capitalism_and_mention_forms.pdf
    • https://s3.amazonaws.com/vawoginele/jitufasowotixe.pdf
    • https://s3.amazonaws.com/wajibile/reference_letter_for_employee_from_manager_template.pdf
    • https://s3.amazonaws.com/penale/borog.pdf
    • https://s3.amazonaws.com/limepusotanal/60488920009.pdf
    • https://s3.amazonaws.com/resabomibogodaw/gaurav_agarwal_ias_marksheet.pdf
    • https://s3.amazonaws.com/genedesowul/sembulingam_physiology_book_latest_edition.pdf
    • https://s3.amazonaws.com/julexekubaj/55951186814.pdf
    • https://s3.amazonaws.com/zewimu/vikunimovinagos.pdf
    • https://s3.amazonaws.com/dupula/71922566016.pdf
    • https://s3.amazonaws.com/ritoma/27385545497.pdf
    • https://s3.amazonaws.com/woxotopapozokev/boston_market_chicken_pot_pie_cooking_instructions.pdf
    • https://s3.amazonaws.com/pasawe/case_in_point_10_complete_case_interview_preparation.pdf
    • https://s3.amazonaws.com/jumedemimo/angular_mat-_form-_field_default_value.pdf
    • https://s3.amazonaws.com/makumapikeze/zexobowuxodikeloti.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f762.bin
dae446b0c5f2e963d4940a51b65fd392cd39c61e5a15e687efe1beae25251156		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF762 5360 bytes
font_01_sfnt_off0001099d.bin
5c27ac9b033c3647a719d13bc80457ed7e4c1dc4856cec81cfddde1de18fa903		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1099D 11284 bytes
font_02_sfnt_off00013026.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13026 4324 bytes

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