Malicious PDF — malware analysis report

Static analysis result for SHA-256 855050c015b1ce99…

MALICIOUS

PDF

92.0 KB Created: 2021-03-16 05:02:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e894092d8d6f5286439ec41430c42fb3 SHA-1: a582e7661e669d49c70bb0ed0f9be5c3c1b557d1 SHA-256: 855050c015b1ce998a4ff10798fabf75502b3fca3b3cbd5b0b3d342f8d55a64d
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to known malicious redirectors and link farms. Heuristics indicate it's a malicious redirector and part of an SEO link farm, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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 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.
  • 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/award?keyword=automatic+process+control+pdf In PDF document text
    • https://cdn.sqhk.co/vaxarogajib/aib1hjr/61707264839.pdfIn PDF document text
    • https://fewegako.weebly.com/uploads/1/3/1/4/131453302/5017687.pdfIn PDF document text
    • https://cdn.sqhk.co/migefareg/dPjjKmM/list_of_top_10_universities_in_america.pdfIn PDF document text
    • https://vilifamizebu.weebly.com/uploads/1/3/4/6/134617150/234d8ca.pdfIn PDF document text
    • https://cdn.sqhk.co/tajugajobib/e1iiigJ/33049982720.pdfIn PDF document text
    • https://cdn.sqhk.co/kisasizaro/CVghihJ/master_assassin_5e.pdfIn PDF document text
    • https://wexivupesowapab.weebly.com/uploads/1/3/2/7/132712225/gakiruliroxotopasisi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/3c0765b1-c247-4b85-a22e-45dd26ca4801/daganorixiwal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b4cae22-3b5a-4d8e-ba3d-35a832b27183/zedulizojenakibelupufusu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6fb32db-b241-4737-a6fe-6362022d54eb/what_are_the_theories_of_learning_in_educational_psychology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c91522f9-0380-498a-8f00-4d09639b30db/59481608431.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84152dc8-f1ce-4f1a-a89f-463840ecad21/61602873983.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bb19f3d-23ec-4361-9c90-147d918ec58d/94370706807.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b3b13e2-c878-469b-bfc6-2a6e8cada083/what_is_the_principles_of_pyramid_of_giza_brainly.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa8d9354-d06b-40de-8182-4a28117c5f95/is_cell_and_molecular_biology_hard.pdfIn PDF document text
    • https://s3.amazonaws.com/lomiwexuva/mefasepavapi.pdfIn PDF document text
    • https://s3.amazonaws.com/xirixepo/sketchbook_mockup_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/696661fb-c433-43bd-a75c-be171496f68e/what_is_the_need_for_knowledge_management_strategy.pdfIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/22889590168.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af84b775-e9a7-459f-8185-23e530b12fc1/71992077923.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/nuzasimasedubevadet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b849d3fc-4160-46eb-9425-884a42583b3f/68515475693.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3489f08-67f8-4d22-a942-d44aeb63e20b/tipos_de_comunicacin.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0A 5172 bytes
SHA-256: ea579413bcbde135da7552a366cbdb6ed34834ca4bd82b9fc9f1880da62484dc
font_01_sfnt_off00012d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7E 11352 bytes
SHA-256: ce3594ad369bc4213f5c5a6766d041ea314335447fd384d2fd372a2816139fd7
font_02_sfnt_off00015467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15467 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34