Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb55d1ecf2c6bd23…

MALICIOUS

PDF

79.3 KB Created: 2021-02-27 23:55:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4987cfa5d2f99dac357a5fe38137e0a5 SHA-1: 7fe787e14b65891ef7cc0c895cd29c79c289ce4a SHA-256: bb55d1ecf2c6bd2319c32e5273e006af6c595695321e0c6872a93572b30652d3
166 Risk Score

Malware Insights

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

The PDF document contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it is a link farm on disposable hosting and specifically identifies the content as an advance-fee lottery or parcel scam lure. The document body, though truncated and partially obfuscated, contains references to 'penny stocks' and financial terms, aligning with the scam narrative. No scripts were extracted, but the presence of multiple malicious URLs suggests a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://xezojetit.ru/123?utm_term=top+10+penny+stocks+2021+in+india
    • https://maselevajaf.weebly.com/uploads/1/3/1/3/131398143/5447f015d8816b.pdf
    • http://doxisolawasusig.66ghz.com/clash_royale_card_upgrade_guide.pdf
    • https://kazowotamije.weebly.com/uploads/1/3/4/0/134012594/gabizefefizapovagere.pdf
    • http://makamar.tech/98775799940lhgaf.pdf
    • http://petersikdar.com/68008492705k8f3v.pdf
    • http://webmastervlad.ru/68755379978nbenf.pdf
    • http://bezigex.iblogger.org/calcutta_university_online_application_form.pdf
    • https://fagudigozupubu.weebly.com/uploads/1/3/6/0/136042622/1589971.pdf
    • http://gutagige.sportsontheweb.net/section_24.1_the_study_of_light.pdf
    • http://ifeelgood.club/how_to_insert_chicago_style_citation_in_wordhkfy1.pdf
    • http://luwogexejel.getenjoyment.net/what_are_the_ninety_five_theses_of_martin_luther.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lesizemub.epizy.com/70978982273.pdf
    • http://pefodajisotavuk.rf.gd/lipimofolegaxi.pdf
    • http://popeladidet.epizy.com/19519076045.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f87b.bin
12bff97c483df104dfb91ff46c49b9a67dd8b67a08c6c23af86dbb7f5925643f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF87B 5380 bytes
font_01_sfnt_off00010af5.bin
f520b7f4c5c215eb388e6717eae1fb1d505d9ba77b7e3a939eb1e3e4f2b0960d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF5 11080 bytes

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