Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce8ec6b326b2d7a7…

MALICIOUS

PDF

69.6 KB Created: 2021-03-22 10:27:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 753e90a4016326de8653e1fadbcb5279 SHA-1: cccaf13b2d04ceab76d71f470ff464b27ce1ea35 SHA-256: ce8ec6b326b2d7a7cca9e91e7ab572413958bca2f950cc14db6e378ff0111aa0
186 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially malicious websites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to distribute or phish via these external links.

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://druttle.ru/strik?utm_term=ferrari+458+spider+for+sale+autotrader PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379603/normal_60132168ac86e.pdfIn PDF document text
    • http://bunnygummy.ru/186715047271g2ci.pdfIn PDF document text
    • http://vonowaz.iblogger.org/cisco_firewall_software.pdfIn PDF document text
    • http://birodavaz.22web.org/spider_man_1_comic.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383912/normal_5fd117da5e9a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406775/normal_6030eb9dde38c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426945/normal_5ff13a5ec4717.pdfIn PDF document text
    • https://puwelivaju.weebly.com/uploads/1/3/4/8/134885893/a762b6.pdfIn PDF document text
    • https://jewukezi.weebly.com/uploads/1/3/0/9/130970006/e1f51d.pdfIn PDF document text
    • http://closemaze.com/simon_ielts_video_freet90is.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470526/normal_6007608566244.pdfIn PDF document text
    • https://vavozeja.weebly.com/uploads/1/3/5/3/135308761/c93c7ed0f33d94.pdfIn PDF document text
    • http://bupatinewesep.66ghz.com/bihar_board_12th_result_2019_marksheet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8533cbf3-c0d6-400c-bdf8-8ca38cf0242b.filesusr.com/ugd/135178_32582d7ce42d48feae08e53adce56d50.pdf?index=trueIn PDF document text
    • https://033a7475-7ccb-45c1-8f1e-38fd320d48d0.filesusr.com/ugd/03a576_e6a039f7d4cd46a398cca40b4c6050ad.pdf?index=trueIn PDF document text
    • https://f27bca7f-571c-471d-9e77-92385e6dfcd0.filesusr.com/ugd/9a0fa1_4e9578f97bbe4b1faa3929d19ab09e18.pdf?index=trueIn PDF document text
    • http://babokad.epizy.com/information_about_ceramic_articles.pdfIn PDF document text
    • http://rajemezipuz.rf.gd/beyblade_games_for_java_mobile.pdfIn PDF document text
    • https://2f2ab42d-e0b4-4bd3-aa50-2430da1ff5fc.filesusr.com/ugd/eaf48f_d6f3329ce2db4aa9958d2bf387b6c472.pdf?index=trueIn PDF document text
    • https://97783159-ced7-426e-9fbd-60d2bb3342fb.filesusr.com/ugd/00058f_74ceead93e234df0ba4049cd64fd2069.pdf?index=trueIn PDF document text
    • http://jasopiwutuv.epizy.com/ramodepotazutaxevenirove.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_off0000d1d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D4 5396 bytes
SHA-256: 753d7cab4024471f64b0f1a134f935caed94660f8148c4ad71a38e53ee179289
font_01_sfnt_off0000e449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE449 10224 bytes
SHA-256: 22f166a59aa19940a1d350649573f78e7954f822cf5c65a01580b95cefefdefb