Malicious PDF — malware analysis report

Static analysis result for SHA-256 227a6441b017949a…

MALICIOUS

PDF

71.0 KB Created: 2021-02-18 02:13:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 93ac0dfaffccd9e38edba8ba0ccf84af SHA-1: ea2dfd5482e7dfff29b0828259b4b8a3b51ae3ce SHA-256: 227a6441b017949a034b1e2057339b76070f43d1e9d5debc29852cbd4ccb8145
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The embedded content, though heavily obfuscated, appears to be a lure related to 'Walmart grocery pickup promo code'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malicious content via the linked URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://crophysi.ru/strik?utm_term=walmart+grocery+pickup+promo+code+reddit PDF link annotation
    • https://cdn.sqhk.co/dizoketa/Uijia6R/tiny_table_tennis_game_y8.pdfIn PDF document text
    • http://zedukibawubige.22web.org/75583288396.pdfIn PDF document text
    • https://cdn.sqhk.co/vibesadebo/ghgj7qa/galaxy_hunter_space_shooter_3d.pdfIn PDF document text
    • http://universal-kirov.ru/zojexevotowamosewawabipv79i.pdfIn PDF document text
    • https://cdn.sqhk.co/bejomewuv/7eM7JZw/wild_wolf_hunter_archery_2019_results.pdfIn PDF document text
    • https://tovejuzu.weebly.com/uploads/1/3/5/3/135398771/ae475ed.pdfIn PDF document text
    • http://jakor.pro/bekobojegapuropooltw.pdfIn PDF document text
    • https://warororob.weebly.com/uploads/1/3/5/3/135314520/6492bede0c11af9.pdfIn PDF document text
    • https://cdn.sqhk.co/puwukuwos/dDJ2hd3/solar_power_plant_business_plan_ppt.pdfIn PDF document text
    • http://excellent-spb.ru/xadub711uv.pdfIn PDF document text
    • https://cdn.sqhk.co/bufutoje/ggYhfgg/titadujipamadadomanot.pdfIn PDF document text
    • http://kernig.pro/sanasoxabooc.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/somisilegex/mabinogi_fantasy_life_cooking_guide.pdfIn PDF document text
    • http://xavisijividefo.epizy.com/travel_expense_report_template_app.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/walking_around_city_quotes.pdfIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/a_cappella_sheet_music_21_guns.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_off0000d719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD719 5396 bytes
SHA-256: 1c997f07010188acd4c7a4123d6c63ce47b4863f733a3aa867bc070da3dffa71
font_01_sfnt_off0000e972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE972 10908 bytes
SHA-256: 1ae3c90ac9eb46d21c615f482070fbaa544cf6776ed6424ba482c51e928e35a0

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