Malicious PDF — malware analysis report

Static analysis result for SHA-256 758b85dd1a86b094…

MALICIOUS

PDF

84.7 KB Created: 2021-03-09 11:43:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4661d6e0ec2423037b8c7c4c25bcfebe SHA-1: d9f620f0032b22ef4ed22afad6638400a60e4bc4 SHA-256: 758b85dd1a86b09481c2578aea026dd9353d46e51f38e945a00736859f1a51ad
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it functions as a link farm designed to redirect users to potentially harmful websites. The document body, though heavily obfuscated, appears to be a lure, possibly for phishing or malware distribution.

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
  • 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://lozipotod.ru/123?utm_term=ids-+2cd8426g0%252F+f-+i+user+guide PDF link annotation
    • http://tapasin.sportsontheweb.net/3_month_old_baby_development_in_hindi.pdfIn PDF document text
    • https://cdn.sqhk.co/vixukose/osWhjZd/easy_lemon_cake_recipe_without_baking_powder.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445570/normal_604325316feab.pdfIn PDF document text
    • https://cdn.sqhk.co/xonarewu/jcoTigm/8336212033.pdfIn PDF document text
    • https://cdn.sqhk.co/demejapad/hiihhha/model_railroad_control_panel_design.pdfIn PDF document text
    • https://cdn.sqhk.co/liminekaj/hh2kfhj/62679898530.pdfIn PDF document text
    • http://nixejawoxakubi.22web.org/what_is_meaning_of_community_development_worker.pdfIn PDF document text
    • http://zavifuvalo.22web.org/chocolate_malayalam_movie_whatsapp_status_video.pdfIn PDF document text
    • http://tizakeguwowil.22web.org/color_by_number_math_worksheets_printable.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415756/normal_5fef441e321e3.pdfIn PDF document text
    • https://cdn.sqhk.co/doxanusubomo/jbhbicq/38041276.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417213/normal_5fe4092837ce3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387031/normal_600bf5141e2b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375541/normal_6027bedeac53a.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vidugozu.atwebpages.com/72119262536.pdfIn PDF document text
    • https://033a7475-7ccb-45c1-8f1e-38fd320d48d0.filesusr.com/ugd/03a576_ab9f6989a4c4471684fc2c93b549f4b7.pdf?index=trueIn PDF document text
    • https://2ac56fc1-f7ee-4366-9cb2-1681469c68ee.filesusr.com/ugd/b914b5_07d3385055ef4caeb02bec3cee7c4182.pdf?index=trueIn PDF document text
    • http://loratozojakin.epizy.com/does_ikea_do_king_single_beds.pdfIn PDF document text
    • http://kukadafimi.rf.gd/ben_10_omniverse_games_free.pdfIn PDF document text
    • http://sonowodiguvab.epizy.com/marvel_cloak_and_dagger_parents_guide.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000108a0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x108A0 7356 bytes
SHA-256: 98490f42f21f7b35ce25c481b7a1751cf93c8b9cf4cffa7b2dca456c6d6d1ad7
font_00_sfnt_off0000f538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF538 5660 bytes
SHA-256: a062cbc5c63b5761515754fefca6a61ad70275e77e8b598eed13335c19321856
font_02_sfnt_off00011ca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA3 12672 bytes
SHA-256: a5befaf4eeff847aa9d4d5ddc393bf539d06687f6d46ffeeb24ae6fa2eab522b