Malicious PDF — malware analysis report

Static analysis result for SHA-256 85c17fd305ec56ec…

MALICIOUS

PDF

99.4 KB Created: 2021-02-13 18:43:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: eee9db19733d2332b5a480ca6233cee2 SHA-1: e247b714fb1ad8f5a2463e5f50ebfddd89fcc5a2 SHA-256: 85c17fd305ec56ec22f764d3daac1a6d943bf7694c846336e562e51c282406df
184 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and an ML classifier, including critical alerts for linking to known malicious redirectors and being part of a link farm on disposable hosting. The embedded URLs, such as 'https://crophysi.ru/wix?keyword=rice+paddy+hat+tattoo', are designed to redirect users to potentially harmful content. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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/wix?keyword=rice+paddy+hat+tattoo In PDF document text
    • http://csxmoney.info/applied_anatomy_of_upper_limbn159s.pdfIn PDF document text
    • https://cdn.sqhk.co/samekikogeri/jatRk0C/rusigekojeko.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451205/normal_60074f96c5578.pdfIn PDF document text
    • https://pajenugemin.weebly.com/uploads/1/3/4/6/134677616/7888647.pdfIn PDF document text
    • http://kleomaften.online/diwulafinovajupuzgn9w.pdfIn PDF document text
    • https://cdn.sqhk.co/pevelefotuve/cgd6wha/amazon_store_card_finance_options.pdfIn PDF document text
    • http://labiosdewonda.com/71139569622bra2p.pdfIn PDF document text
    • http://alphabitx.com/exploding_box_templates_freej3j60.pdfIn PDF document text
    • https://depasosuva.weebly.com/uploads/1/3/4/4/134483816/gosivowowan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485572/normal_60223518d0c81.pdfIn PDF document text
    • http://drilltech.info/britney_spears_mp3_songs_free_download9piss.pdfIn PDF document text
    • https://cdn.sqhk.co/tabotewo/oijJRij/what_is_my_smtp_server_name_for_hotmail.pdfIn PDF document text
    • http://msertis.xyz/wedotitatokivoxyobfy.pdfIn PDF document text
    • http://winsbig.space/ttm_squeeze_indicator4gxfn.pdfIn PDF document text
    • https://cdn.sqhk.co/gulezepu/CWbgigg/off_road_motorcycle_riding_techniques.pdfIn PDF document text
    • http://ketosimple.online/apprenticeship_levy_training_provider_guider08am.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwopaperuv/1enqgcH/nosagi.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/batoragubukepo/antivirus_removal_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/heretic_gods_leveling_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/76143873171.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://www.gnu.org/licenses/lgpl.htmlRegularDanhHongIn PDF document text
    • http://www.geocities.com/dnhhngIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.orgIn PDF document text

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE96 7172 bytes
SHA-256: c224c1220f6042d7541b2016977c74c5a64e1a4d5d46ad29e066eba2d9498a8b
font_01_sfnt_off0001070c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070C 4964 bytes
SHA-256: 8b3765f115b8931591de8ed766b24c7398521b4e45f92a5252d38c2f16578a68
font_02_sfnt_off000117fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FD 4708 bytes
SHA-256: a4357d687b7cb5f8b7286b4aa69b48d6eaa42da2cf08e2cf72e3336bf20e6cec
font_03_sfnt_off00012720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12720 4436 bytes
SHA-256: 7a5f38e08dbe6687f7cda72612514a7a84d8ef8be0eb0fa4cdd43a6e1300b9e1
font_04_sfnt_off000134b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B9 11140 bytes
SHA-256: 47b6ebf93ddfe7db60ecc83e0af974ceaeb8faf588a5948a4389d62651b98676
font_05_sfnt_off00015a38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A38 16368 bytes
SHA-256: 1faca5decf8463c42c5c0c4cad9d908ee57b4de9c36593d4658cf0243c79837b
font_06_sfnt_off0001706b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1706B 4280 bytes
SHA-256: 50ae22a8a9bc2aa33b18797210700aa000ec97f6933438e088da7389574fa659

Open this report in the interactive analyzer, or submit your own file for analysis.