Malicious PDF — malware analysis report

Static analysis result for SHA-256 167d62b941740669…

MALICIOUS

PDF

74.0 KB Created: 2021-02-15 04:03:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1dd7703f89b11d89e3ad7a3ea0a18338 SHA-1: 5bfb0d232b86869ab043f1577ee2bacf8a3f0fb3 SHA-256: 167d62b941740669224f8371de9ba5729306708adeead0d5d8a2718c6e6b324e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9995

Heuristics 5

  • 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 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://leonvi.ru/wix?keyword=balancing+chemical+equations+worksheet+1+answer+key PDF link annotation
    • http://trynutra.shop/search_em_all_apkiq4v9.pdfIn PDF document text
    • http://my-favshoph.online/83568221435oia6b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460048/normal_5ffdb55f26a64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414488/normal_60205ec7839a1.pdfIn PDF document text
    • https://fatomomome.weebly.com/uploads/1/3/1/6/131606630/dbff7a18e6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476437/normal_6004e2486af59.pdfIn PDF document text
    • http://kengoru.space/joplin_humane_society_volunteernt9uq.pdfIn PDF document text
    • http://videohost.space/lucky_block_mod_mcpe_downloadd7lli.pdfIn PDF document text
    • http://kagotigidiwijar.iblogger.org/kadafugutetal.pdfIn PDF document text
    • http://winoraama.website/25657268473vqvjg.pdfIn PDF document text
    • http://semazolowogafoj.22web.org/2422203091.pdfIn PDF document text
    • http://tojukuw.iblogger.org/xogasizoga.pdfIn PDF document text
    • http://sukujemegamog.22web.org/lodokumavinila.pdfIn PDF document text
    • http://mazanatur.space/jenimuj96by.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470972/normal_5ff8d50764860.pdfIn PDF document text
    • http://3bki.ru/48956263851hia57.pdfIn PDF document text
    • http://douchehub.xyz/geraxakumafesuqrx8d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gilebufamefaf.rf.gd/asphalt_8_airborne_games.pdfIn PDF document text
    • http://wadirezox.epizy.com/broadsheet_perth_cbd.pdfIn PDF document text
    • http://bavodokebak.rf.gd/commandos_1_2_3.pdfIn PDF document text
    • http://fiwepive.rf.gd/doxamujarog.pdfIn PDF document text
    • http://dagogedimin.rf.gd/app_backup_and_restore_apkpure.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_off0000e3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FB 5696 bytes
SHA-256: e1bbf9786096acc8a58ca338813e52068660c83b748f2cf0ac5bc6cded1ed104
font_01_sfnt_off0000f753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF753 10104 bytes
SHA-256: 4a12626c016bea0b5d35f1b69721696f225e596268cbabd7526371d239d5bb09