Malicious PDF — malware analysis report

Static analysis result for SHA-256 41a57f37520de3e8…

MALICIOUS

PDF

87.6 KB Created: 2021-02-18 19:01:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 18cf532f5edc3a066e59a902adb9d2d3 SHA-1: a627166d33391568cf743e85f8bf7c5b5d0d1522 SHA-256: 41a57f37520de3e8c0e977059422bb6a94c6ed58afd240354464d6aee654bf69
192 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains multiple links to redirector infrastructure, including one specifically noted as a malicious redirector. The presence of a 'download button' heuristic further suggests a social engineering lure to trick users into downloading a payload. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest it's designed to lead the user to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://yafferge.ru/strik?utm_term=fifty+shades+of+grey+free+download+filmywap In PDF document text
    • https://cdn.sqhk.co/bevizewo/hge0SfZ/domino_effect_scientific_definition.pdfIn PDF document text
    • http://virnet77.ru/8422096464zy22d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389576/normal_5fe66eaf66136.pdfIn PDF document text
    • http://faceit.su/what_type_of_transmission_fluid_for_2003_ford_rangerzcy28.pdfIn PDF document text
    • http://fortuneo-enligne.com/recipe_for_disaster_skyrimk3ls4.pdfIn PDF document text
    • https://sonefexezeripu.weebly.com/uploads/1/3/0/7/130739000/kufov.pdfIn PDF document text
    • http://istlan.space/three_letter_words_spelling_worksheetsnr0d9.pdfIn PDF document text
    • https://xoxovumalojiru.weebly.com/uploads/1/3/0/8/130874224/remesa_sefeluxodu.pdfIn PDF document text
    • https://voberugupov.weebly.com/uploads/1/3/4/4/134496708/rasinoza.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.fontrix.comhttp://www.nhncorp.comIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://laguzovola.rf.gd/32286933673.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/63315731090.pdfIn PDF document text
    • http://fuvogixerad.epizy.com/48622533523.pdfIn PDF document text
    • http://leporib.epizy.com/harry_potter_deathly_hallows_part_2_cast_harrys_son.pdfIn PDF document text
    • http://rujemivegelap.epizy.com/cm_browser_cracked_apk.pdfIn PDF document text
    • http://norenuwidubeg.rf.gd/78922105645.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/64811033635.pdfIn PDF document text
    • https://s3.amazonaws.com/nasitevu/calcio_femminile_mondiali_formazione_italia.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2B 2888 bytes
SHA-256: 26ba5c8d1583574648fd6e595d23dee3122ef52e1b97b4330dab96c4d4c4123d
font_01_sfnt_off0000e76e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76E 5392 bytes
SHA-256: ce70fd03cb3403870ba7732b4a5c7c3113a918f57cf86424d401831474e6dae6
font_02_sfnt_off0000f9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AB 12552 bytes
SHA-256: 30a5e268480e3747963a554245890bbde834db04009131c8346ef22a8341d389
font_03_sfnt_off00012291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12291 2056 bytes
SHA-256: 589f2a64e89766a8ae62896ea8444fa1a87810255c984bbc4fd2a260c4929d56
font_04_sfnt_off00012b80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B80 16060 bytes
SHA-256: c8d346df762f100b7f07f64474ebeefa7e764d1f3fb651c1b54482bebfbb2c95
font_05_sfnt_off00014019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14019 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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