Malicious PDF — malware analysis report

Static analysis result for SHA-256 94c0ad2d6e528c19…

MALICIOUS

PDF

78.9 KB Created: 2021-03-25 11:43:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 2dbc618e768e014e60b8b55762da529c SHA-1: 121a770da4fed3fe304b26fa25157afd0387d8c5 SHA-256: 94c0ad2d6e528c19c52bc28a34cdb1d8e5817cec130e462c060dfabf9fae1f17
244 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to disposable hosting services, indicating a link farm designed to distribute traffic. One of the extracted URLs, 'https://crophysi.ru/strik?utm_term=friedrich+nietzsche+asi+hablo+zaratustra+frases', is flagged as malicious. The presence of numerous external links suggests an attempt to redirect users to potentially harmful content, aligning with phishing or scamming tactics.

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
  • 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.
  • 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/strik?utm_term=friedrich+nietzsche+asi+hablo+zaratustra+frases In PDF document text
    • https://zufuxanibagi.weebly.com/uploads/1/3/4/5/134586570/verizu.pdfIn PDF document text
    • https://daxajofu.weebly.com/uploads/1/3/0/7/130740026/rejipijitena-lomokaxesodored.pdfIn PDF document text
    • http://resokipuga.getenjoyment.net/couper_un_en_deux_pages.pdfIn PDF document text
    • http://zitokujamu.mypressonline.com/kulosiza.pdfIn PDF document text
    • https://xuvurabog.weebly.com/uploads/1/3/2/6/132696285/6517376.pdfIn PDF document text
    • http://dasiwujupuna.sportsontheweb.net/budigoduw.pdfIn PDF document text
    • https://popagupo.weebly.com/uploads/1/3/1/4/131407300/gimoxikej.pdfIn PDF document text
    • http://gakukuketisalum.scienceontheweb.net/analytical_techniques_in_biotechnology.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/abe6ee97-a176-4178-adb5-c58c573f5b1a/60266796162.pdfIn PDF document text
    • http://namezenidel.onlinewebshop.net/nalorefazipopigowol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d69a1f44-f45b-430a-a6cd-0d91c8384824/60981199988.pdfIn PDF document text
    • https://fad58b31-c538-4d3f-828d-7998eec853b9.filesusr.com/ugd/7e6083_c72aa9d316d44db59be41f3dab1eb02a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pafexegud/does_sex_during_menstruation_cause_cervical_cancer.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/21943664540.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/child_support_information_sheet_texas.pdfIn PDF document text
    • https://4cd5eafb-d261-4666-a528-29b55b1676c1.filesusr.com/ugd/8dde66_e8730e97c8e5432b87672dee69139eee.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/megulu/yesterday_once_more_piano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebd633ef-b9bc-4e73-be3e-8ca234c64fa6/air_force_ones_womens_white_size_8.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/501f58d1-3d67-48b5-9129-36138d5d3cc2/dd_4e_avenger_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d21518fb-8f5b-4df3-8daf-4d97536a7e3b/oster_blender_reviews_ratings.pdfIn PDF document text
    • http://tiredosutozol.atwebpages.com/dna_structure_coloring_worksheet_answer_key.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_off0000f323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF323 5256 bytes
SHA-256: 4a46e32abfd0b054d2f0fa24589e8b6d9058b3d60418be8b846f11106735a578
font_01_sfnt_off000104fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FE 11996 bytes
SHA-256: f527645618995a14568606c9e4cbeca4deeadd4c4d4b4187a7e2408379e642cf