Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e1e8e6035c68165…

MALICIOUS

PDF

110.9 KB Created: 2021-03-13 16:14:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: bdc9cd481a21241e1de1903079d869db SHA-1: 4485de597cd8bc85dac3eeebac6bf9a74cb5d9ac SHA-256: 2e1e8e6035c68165a4bf64ad34d7d3a7c09f8d47323a51d7a318d23bf9a0c7ba
192 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for a link to known malicious redirector infrastructure. The ML classifier also flagged the PDF with high confidence. The presence of a 'download button' heuristic suggests a lure to download further malicious content. No scripts were extracted, but the primary attack vector appears to be directing users to malicious websites via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crophysi.ru/wix?keyword=amoeba+sisters+mitosis+worksheet+key In PDF document text
    • https://cdn.sqhk.co/pijajawopoji/uhbjawB/metadirinufodimaf.pdfIn PDF document text
    • http://kevakigev.medianewsonline.com/assignment_front_page_aiou.pdfIn PDF document text
    • http://zitokujamu.mypressonline.com/rugavimefaluna.pdfIn PDF document text
    • https://cdn.sqhk.co/rubutemoxe/bgcUha3/3172604516.pdfIn PDF document text
    • https://cdn.sqhk.co/kirinitaxuk/pjdeJgj/96270743627.pdfIn PDF document text
    • http://roralukomoko.22web.org/ccleaner_update_version_free.pdfIn PDF document text
    • http://faripofijukevom.mywebcommunity.org/94562249378.pdfIn PDF document text
    • http://gepexoliv.medianewsonline.com/63625159302.pdfIn PDF document text
    • http://zevibeponakat.getenjoyment.net/batman_a_death_in_the_family_original_comic.pdfIn PDF document text
    • http://sowipilarow.mygamesonline.org/97461726896.pdfIn PDF document text
    • http://tigibisolefora.mygamesonline.org/zalurowuz.pdfIn PDF document text
    • http://tifeguga.22web.org/seren.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pelebirepopo.onlinewebshop.net/argumentative_essay_structure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31a201ff-30f3-4fd2-9942-4fead90e4a16/what_lubricant_to_use_on_nordictrack_treadmill.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59756c6c-6163-4690-b34a-8eb038282e91/vedexoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/631f34c7-f533-4736-bdee-c2d5c60cd6be/tesepebanibamokazo.pdfIn PDF document text
    • http://bexukavibume.myartsonline.com/pivilivunusinajajakuriso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dde464d6-404f-489a-95ea-e3aec9be799d/what_company_owns_greenworks.pdfIn PDF document text
    • http://fenulujexita.epizy.com/2015_acura_tlx_performance_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4345992f-2207-4f1e-b928-a83e4638ca98/alexa_xbox_one_commands_list.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001608f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1608F 5280 bytes
SHA-256: 807629c602619f70803b7c2352e5ee538ae4830166cb644da4fd73b0e11e7723
font_01_sfnt_off00017269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17269 10944 bytes
SHA-256: 34bfeb605b381438decae288e7f03a054f1cdbee28622ee337e3374c3134fca2
font_02_sfnt_off0001981a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1981A 16204 bytes
SHA-256: 31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf